solved errors

7 files changed, 1995 insertions, 43 deletions

diff --git a/C++_Demystified:_A_Self-Teaching_Guide/.ipynb_checkpoints/chapter13-checkpoint.ipynb b/C++_Demystified:_A_Self-Teaching_Guide/.ipynb_checkpoints/chapter13-checkpoint.ipynb
new file mode 100755
index 00000000..8c87053f
--- /dev/null
+++ b/C++_Demystified:_A_Self-Teaching_Guide/.ipynb_checkpoints/chapter13-checkpoint.ipynb
@@ -0,0 +1,412 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:60c23a8f50ffb51e0da71a6e8b36475b7941871a6f534003180327a651bb1c1c"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 13: Persistent Data: File Input and Output"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 13.1, page no. 296"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "try:\n",
+      "    if(fp):\n",
+      "        print \"infile = \", fp\n",
+      "        print \"0\"\n",
+      "except IOError:\n",
+      "    print \"1\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "1\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 13.2, page no. 296"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "try:\n",
+      "    fp = open(\"students.dat\", \"w\")\n",
+      "    if(fp):\n",
+      "        print \"infile = \", fp\n",
+      "        print \"0\"\n",
+      "except IOError:\n",
+      "    print \"1\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "infile =  <open file 'students.dat', mode 'w' at 0x2d80a50>\n",
+        "0\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 13.3, page no. 299"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "fp = open(\"students.dat\", \"w\")\n",
+      "print \"Writing to the file\"\n",
+      "print \"===================\"\n",
+      "print \"Enter class name: \",\n",
+      "data = raw_input()\n",
+      "fp.write(data)\n",
+      "fp.write(\"\\n\")\n",
+      "print \"Enter number of students: \",\n",
+      "data = raw_input()\n",
+      "fp.write(data)\n",
+      "fp.close()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Writing to the file\n",
+        "===================\n",
+        "Enter class name: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "C++\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter number of students: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "32\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 13.4, page no. 301"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "fp = open(\"students.dat\", \"w\")\n",
+      "print \"Writing to the file\"\n",
+      "print \"===================\"\n",
+      "print \"Enter class name: \",\n",
+      "data = raw_input()\n",
+      "fp.write(data)\n",
+      "fp.write(\"\\n\")\n",
+      "print \"Enter number of students: \",\n",
+      "data = raw_input()\n",
+      "fp.write(data)\n",
+      "fp.close()\n",
+      "fp = open(\"students.dat\", \"r\")\n",
+      "print \"Reading from the file\"\n",
+      "print \"=====================\"\n",
+      "lines = fp.readlines()\n",
+      "for line in lines:\n",
+      "    print line\n",
+      "fp.close()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Writing to the file\n",
+        "===================\n",
+        "Enter class name: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "C++\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter number of students: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "32\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Reading from the file\n",
+        "=====================\n",
+        "C++\n",
+        "\n",
+        "32\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "example 13.5, page no. 303"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "fp = open(\"students.dat\", \"w\")\n",
+      "print \"Writing to the file\"\n",
+      "print \"===================\"\n",
+      "print \"Enter class name: \",\n",
+      "data = raw_input()\n",
+      "fp.write(data)\n",
+      "fp.write(\"\\n\")\n",
+      "print \"Enter number of students: \",\n",
+      "data = raw_input()\n",
+      "fp.write(data)\n",
+      "fp.close()\n",
+      "fp = open(\"students.dat\", \"r\")\n",
+      "print \"Reading from the file\"\n",
+      "print \"=====================\"\n",
+      "lines = fp.readlines()\n",
+      "for line in lines:\n",
+      "    print line\n",
+      "fp.close()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Writing to the file\n",
+        "===================\n",
+        "Enter class name: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "C++\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter number of students: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "32\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Reading from the file\n",
+        "=====================\n",
+        "C++\n",
+        "\n",
+        "32\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 13.6, page no. 305"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "fp = open(\"students.dat\", \"w\")\n",
+      "print \"Writing to the file\"\n",
+      "print \"===================\"\n",
+      "print \"Enter class name: \",\n",
+      "data = raw_input()\n",
+      "fp.write(data)\n",
+      "fp.write(\"\\n\")\n",
+      "print \"Enter number of students: \",\n",
+      "data = raw_input()\n",
+      "fp.write(data)\n",
+      "fp.close()\n",
+      "fp = open(\"students.dat\", \"r\")\n",
+      "print \"Reading from the file\"\n",
+      "print \"=====================\"\n",
+      "while(fp.readline()):\n",
+      "    print fp.readline()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Writing to the file\n",
+        "===================\n",
+        "Enter class name: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "C++\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter number of students: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "32\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Reading from the file\n",
+        "=====================\n",
+        "32\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file
diff --git a/C++_Demystified:_A_Self-Teaching_Guide/.ipynb_checkpoints/chapter5-checkpoint.ipynb b/C++_Demystified:_A_Self-Teaching_Guide/.ipynb_checkpoints/chapter5-checkpoint.ipynb
new file mode 100755
index 00000000..9dac1dd3
--- /dev/null
+++ b/C++_Demystified:_A_Self-Teaching_Guide/.ipynb_checkpoints/chapter5-checkpoint.ipynb
@@ -0,0 +1,488 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:527aef20f7b40df168e6ff4a5ccb96d249aaf7c6743cc854ce1a221227ecfb75"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 5 - Making Decisions: if and switch Statements"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 5.1, page no. 100"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "a = 4\n",
+      "b = 5\n",
+      "print a, \" > \", b, \" is \", (a > b)\n",
+      "print a, \" >= \", b, \" is \", (a >= b)\n",
+      "print a, \" == \", b, \" is \", (a == b)\n",
+      "print a, \" <= \", b, \" is \", (a <= b)\n",
+      "print a, \" < \", b, \" is \", (a < b)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "4  >  5  is  False\n",
+        "4  >=  5  is  False\n",
+        "4  ==  5  is  False\n",
+        "4  <=  5  is  True\n",
+        "4  <  5  is  True\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 5.2, page no. 102"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "print \"Enter number of preregistered students: \",\n",
+      "total = int(raw_input())\n",
+      "print \"Enter number of students adding the course: \",\n",
+      "added = int(raw_input())\n",
+      "total = total + added\n",
+      "print \"Total number of students: \", total"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter number of preregistered students: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "30\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter number of students adding the course: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "3\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Total number of students:  33\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 5.3, page no. 104"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "print \"Enter a whole number: \",\n",
+      "num = int(raw_input())\n",
+      "if (num % 2 == 0):\n",
+      "    print \"The number is even\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a whole number: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "4\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " The number is even\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 5.4, page no. 108"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "print \"Enter a whole number: \",\n",
+      "num = int(raw_input())\n",
+      "if (num % 2 == 0):\n",
+      "    print \"The number is even\"\n",
+      "else:\n",
+      "    print \"The number is odd\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a whole number: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "5\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " The number is odd\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 5.4, page no. 109"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "print \"Enter a whole number: \",\n",
+      "num = int(raw_input())\n",
+      "print \"The number is\", (\"even\" if num %2 == 0 else \"odd\")"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a whole number: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "6\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " The number is even\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 5.6, page no. 112"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "print \"Enter your test score: \",\n",
+      "testScore = int(raw_input())\n",
+      "if (testScore >= 90 ):\n",
+      "    print \"Your grade is an A\"\n",
+      "elif (testScore >= 80 ):\n",
+      "    print \"Your grade is a B\"\n",
+      "elif (testScore >= 70 ):\n",
+      "    print \"Your grade is a C\"\n",
+      "elif (testScore >= 60 ):\n",
+      "    print \"Your grade is a D\"\n",
+      "else:\n",
+      "    print \"Your grade is an F\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter your test score: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "70\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Your grade is a C\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 5.7, page no. 115"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "print \"Enter your grade: \",\n",
+      "grade = raw_input()\n",
+      "\n",
+      "if grade == 'A':\n",
+      "    print \"Your average must be between 90 - 100\"\n",
+      "elif grade == 'B':\n",
+      "    print \"Your average must be between 80 - 89\"\n",
+      "elif grade == 'C':\n",
+      "    print \"Your average must be between 70 - 79\"\n",
+      "elif grade == 'D':\n",
+      "    print \"Your average must be between 60 - 69\"\n",
+      "else:\n",
+      "    print \"Your average must be below 60\" "
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter your grade: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "D\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Your average must be between 60 - 69\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 5.8, page no. 118"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "\n",
+      "print \"Enter your grade: \",\n",
+      "grade = raw_input()\n",
+      "\n",
+      "if grade == 'A' or grade == 'a':\n",
+      "    print \"Your average must be between 90 - 100\"\n",
+      "elif grade == 'B' or grade == 'b':\n",
+      "    print \"Your average must be between 80 - 89\"\n",
+      "elif grade == 'C' or grade == 'c':\n",
+      "    print \"Your average must be between 70 - 79\"\n",
+      "elif grade == 'D' or grade == 'd':\n",
+      "    print \"Your average must be between 60 - 69\"\n",
+      "else:\n",
+      "    print \"Your average must be below 60\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter your grade: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "d\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Your average must be between 60 - 69\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 5.9, page no. 119"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "\n",
+      "print \"Choose your car\"\n",
+      "print \"S for Standard\"\n",
+      "print \"L for Leather Seats\"\n",
+      "print \"D for Leather Seats + Chrome Wheels\"\n",
+      "choice = raw_input()\n",
+      "print \"Extra features purchased\"\n",
+      "if choice == 'D':\n",
+      "    print \"Chrome wheels\\n\"\n",
+      "elif choice == 'L':\n",
+      "    print \"Leather seats\"\n",
+      "else:\n",
+      "    print \"None selected\"\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Choose your car\n",
+        "S for Standard\n",
+        "L for Leather Seats\n",
+        "D for Leather Seats + Chrome Wheels\n"
+       ]
+      }
+     ],
+     "prompt_number": "*"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file
diff --git a/C++_Demystified:_A_Self-Teaching_Guide/.ipynb_checkpoints/chapter9-checkpoint.ipynb b/C++_Demystified:_A_Self-Teaching_Guide/.ipynb_checkpoints/chapter9-checkpoint.ipynb
new file mode 100755
index 00000000..5b5e1ccb
--- /dev/null
+++ b/C++_Demystified:_A_Self-Teaching_Guide/.ipynb_checkpoints/chapter9-checkpoint.ipynb
@@ -0,0 +1,1033 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:f0e84b29896f17b0ff44f8bccf20cf041a408375d83b3bc2290848ec54364369"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 9 - Functions"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.1, page no. 179"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "def main(): #defining a function \n",
+      "    print \"Hello World!\"\n",
+      "\n",
+      "main()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Hello World!\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.2, page no. 180"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "def printMessage(): # defining function\n",
+      "    print \"Hello world!\"\n",
+      "\n",
+      "printMessage() # calling the function"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Hello world!\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.3, page no. 181"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "printMessage();\n",
+      "\n",
+      "def printMessage():\n",
+      "    print \"Hello world!\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Hello world!\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.4, page no. 182"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "def printMessage():\n",
+      "    print \"Hello world!\"\n",
+      "\n",
+      "printMessage()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Hello world!\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.5, page no. 184"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "def printMessage():\n",
+      "    times = 0\n",
+      "    times += 1\n",
+      "    print \"This function called \", times, \" times\"\n",
+      "\n",
+      "\n",
+      "\n",
+      "choice = '1'\n",
+      "while(choice != 'Q'):\n",
+      "    print \"Enter Q to quit, any other character to continue: \",\n",
+      "    choice = raw_input()\n",
+      "    if (choice == 'Q'):\n",
+      "        print \"Input stopped\"\n",
+      "    else:\n",
+      "        printMessage()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "e\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  1  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "e\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  1  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "q\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  1  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Q\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Input stopped\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.6, page no. 185"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "def printMessage():\n",
+      "    times = 0\n",
+      "    times += 1\n",
+      "    print \"This function called \", times, \" times\"\n",
+      "\n",
+      "\n",
+      "choice = '1'\n",
+      "while(choice != 'Q'):\n",
+      "    print \"Enter Q to quit, any other character to continue: \",\n",
+      "    choice = raw_input()\n",
+      "    if (choice == 'Q'):\n",
+      "        print \"Input stopped\"\n",
+      "    else:\n",
+      "        printMessage()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "w\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  1  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "q\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  1  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Q\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Input stopped\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.7, page no. 186"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "times = 0\n",
+      "def printMessage():\n",
+      "    global times\n",
+      "    times += 1\n",
+      "    print \"This function called \", times, \" times\"\n",
+      "\n",
+      "\n",
+      "choice = '1'\n",
+      "while(choice != 'Q'):\n",
+      "    print \"Enter Q to quit, any other character to continue: \",\n",
+      "    choice = raw_input()\n",
+      "    if (choice == 'Q'):\n",
+      "        print \"Input stopped\"\n",
+      "    else:\n",
+      "        printMessage()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "w\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  1  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "t\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  2  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "u\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  3  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Q\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Input stopped\n"
+       ]
+      }
+     ],
+     "prompt_number": 11
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.8, page no. 189"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "times = 0\n",
+      "def printMessage():\n",
+      "    global times\n",
+      "    times += 1\n",
+      "    print \"This function called \", times, \" times\"\n",
+      "\n",
+      "\n",
+      "choice = '1'\n",
+      "while(choice != 'Q'):\n",
+      "    print \"Enter Q to quit, any other character to continue: \",\n",
+      "    choice = raw_input()\n",
+      "    if (choice == 'Q'):\n",
+      "        print \"Input stopped\"\n",
+      "    else:\n",
+      "        printMessage()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "w\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  1  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "r\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  2  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "t\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  3  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Q\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Input stopped\n"
+       ]
+      }
+     ],
+     "prompt_number": 12
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.9, page no. 190"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "def printMessage():\n",
+      "    print \"You inputted \", str\n",
+      "\n",
+      "print \"Enter a string: \",\n",
+      "str = raw_input()\n",
+      "printMessage()\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a string: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Jeff\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " You inputted  Jeff\n"
+       ]
+      }
+     ],
+     "prompt_number": 22
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.10, page no. 191"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "def printMessage(s):\n",
+      "    print \"You inputted \", s\n",
+      "\n",
+      "print \"Enter a string: \",\n",
+      "str = raw_input()\n",
+      "printMessage(str)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a string: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Jeff\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " You inputted  Jeff\n"
+       ]
+      }
+     ],
+     "prompt_number": 21
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.11, page no. 193"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "def printMessage(firstName, lastName):\n",
+      "    print \"Your name is \",  firstName, \" \", lastName\n",
+      "\n",
+      "print \"Enter first name:\",\n",
+      "name1 = raw_input()\n",
+      "print \"Enter last name:\",\n",
+      "name2 = raw_input()\n",
+      "printMessage(name1, name2)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter first name:"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Jeff\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter last name:"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Kent\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Your name is  Jeff   Kent\n"
+       ]
+      }
+     ],
+     "prompt_number": 20
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.12, page no. 194"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "def printMessage(thename, theage):\n",
+      "    print \"Your name is \",  thename, \" and your age is\", theage\n",
+      "\n",
+      "print \"Enter name:\",\n",
+      "name = raw_input()\n",
+      "print \"Enter age:\",\n",
+      "age = int(raw_input())\n",
+      "printMessage(name, age)\n",
+      "printMessage(age, name)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter name:"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Jeff\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter age:"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "34\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Your name is  Jeff  and your age is 34\n",
+        "Your name is  34  and your age is Jeff\n"
+       ]
+      }
+     ],
+     "prompt_number": 17
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.13, page no. 195"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "def doubleIt(x):\n",
+      "    print \"The number to be doubled is \", x\n",
+      "    x *= 2\n",
+      "    print \"The number doubled in doubleIt is \", x\n",
+      "\n",
+      "print \"Enter number: \",\n",
+      "num = int(raw_input())\n",
+      "doubleIt(num)\n",
+      "print \"The number doubled outside the function is \", num,"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter number: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "34\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " The number to be doubled is  34\n",
+        "The number doubled in doubleIt is  68\n",
+        "The number doubled outside the function is  34\n"
+       ]
+      }
+     ],
+     "prompt_number": 18
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.14, page no. 196"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "li = [0]\n",
+      "def doubleIt():\n",
+      "    print \"The number to be doubled is \", li[0]\n",
+      "    li[0] *= 2\n",
+      "    print \"The number doubled in doubleIt is \", li[0]\n",
+      "    \n",
+      "print \"Enter number: \",\n",
+      "num = int(raw_input())\n",
+      "li[0] = num\n",
+      "doubleIt()\n",
+      "print \"The number doubled outside the function is \", li[0]"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter number: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "5\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " The number to be doubled is  5\n",
+        "The number doubled in doubleIt is  10\n",
+        "The number doubled outside the function is  10\n"
+       ]
+      }
+     ],
+     "prompt_number": 19
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.15, page no. 197"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "z = []\n",
+      "def addNumbers (a, b):\n",
+      "    z.append(a + b)\n",
+      "\n",
+      "\n",
+      "print \"Enter first number: \",\n",
+      "firstNum = int(raw_input())\n",
+      "print \"Enter second number: \",\n",
+      "secondNum = int(raw_input())\n",
+      "addNumbers(firstNum, secondNum)\n",
+      "print firstNum, \" + \", secondNum, \" = \", z[0]"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter first number: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "3\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter second number: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "4\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " 3  +  4  =  7\n"
+       ]
+      }
+     ],
+     "prompt_number": 23
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 9.16, page no. 199"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "def addNumbers(x, y):\n",
+      "    return x + y\n",
+      "\n",
+      "print \"Enter first number: \",\n",
+      "firstNum = int(raw_input())\n",
+      "print \"Enter second number: \",\n",
+      "secondNum = int(raw_input())\n",
+      "sum = addNumbers(firstNum, secondNum)\n",
+      "print firstNum, \" + \", secondNum, \" = \", sum\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter first number: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "4\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter second number: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "5\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " 4  +  5  =  9\n"
+       ]
+      }
+     ],
+     "prompt_number": 24
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file
diff --git a/C++_Demystified:_A_Self-Teaching_Guide/chapter13.ipynb b/C++_Demystified:_A_Self-Teaching_Guide/chapter13.ipynb
index a7e400b9..8c87053f 100755
--- a/C++_Demystified:_A_Self-Teaching_Guide/chapter13.ipynb
+++ b/C++_Demystified:_A_Self-Teaching_Guide/chapter13.ipynb
@@ -41,17 +41,14 @@
      "metadata": {},
      "outputs": [
       {
-       "ename": "NameError",
-       "evalue": "name 'fp' is not defined",
-       "output_type": "pyerr",
-       "traceback": [
-        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mNameError\u001b[0m                                 Traceback (most recent call last)",
-        "\u001b[1;32m<ipython-input-1-112e202a5944>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      4\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      5\u001b[0m \u001b[1;32mtry\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 6\u001b[1;33m     \u001b[1;32mif\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mfp\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      7\u001b[0m         \u001b[1;32mprint\u001b[0m \u001b[1;34m\"infile = \"\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mfp\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      8\u001b[0m         \u001b[1;32mprint\u001b[0m \u001b[1;34m\"0\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
-        "\u001b[1;31mNameError\u001b[0m: name 'fp' is not defined"
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "1\n"
        ]
       }
      ],
-     "prompt_number": 1
+     "prompt_number": 4
     },
     {
      "cell_type": "heading",
diff --git a/C++_Demystified:_A_Self-Teaching_Guide/chapter5.ipynb b/C++_Demystified:_A_Self-Teaching_Guide/chapter5.ipynb
index 7973421f..e0f1a684 100755
--- a/C++_Demystified:_A_Self-Teaching_Guide/chapter5.ipynb
+++ b/C++_Demystified:_A_Self-Teaching_Guide/chapter5.ipynb
@@ -459,31 +459,8 @@
      ],
      "language": "python",
      "metadata": {},
-     "outputs": [
-      {
-       "ename": "StdinNotImplementedError",
-       "evalue": "raw_input was called, but this frontend does not support stdin.",
-       "output_type": "pyerr",
-       "traceback": [
-        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mStdinNotImplementedError\u001b[0m                  Traceback (most recent call last)",
-        "\u001b[1;32m/home/jovina/TBC/hardik/c++-demystified/<ipython-input-1-44ee42c69511>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      7\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"L for Leather Seats\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      8\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"D for Leather Seats + Chrome Wheels\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 9\u001b[1;33m \u001b[0mchoice\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mraw_input\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m     10\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"Extra features purchased\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     11\u001b[0m \u001b[1;32mif\u001b[0m \u001b[0mchoice\u001b[0m \u001b[1;33m==\u001b[0m \u001b[1;34m'D'\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
-        "\u001b[1;32m/home/jovina/epd/lib/python2.7/site-packages/IPython/zmq/ipkernel.pyc\u001b[0m in \u001b[0;36m<lambda>\u001b[1;34m(prompt)\u001b[0m\n\u001b[0;32m    251\u001b[0m             \u001b[0mraw_input\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;32mlambda\u001b[0m \u001b[0mprompt\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;34m''\u001b[0m\u001b[1;33m:\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0m_raw_input\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mprompt\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mident\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mparent\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    252\u001b[0m         \u001b[1;32melse\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m--> 253\u001b[1;33m             \u001b[0mraw_input\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;32mlambda\u001b[0m \u001b[0mprompt\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;34m''\u001b[0m \u001b[1;33m:\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0m_no_raw_input\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m    254\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    255\u001b[0m         \u001b[1;32mif\u001b[0m \u001b[0mpy3compat\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mPY3\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
-        "\u001b[1;32m/home/jovina/epd/lib/python2.7/site-packages/IPython/zmq/ipkernel.pyc\u001b[0m in \u001b[0;36m_no_raw_input\u001b[1;34m(self)\u001b[0m\n\u001b[0;32m    443\u001b[0m         \"\"\"Raise StdinNotImplentedError if active frontend doesn't support\n\u001b[0;32m    444\u001b[0m         stdin.\"\"\"\n\u001b[1;32m--> 445\u001b[1;33m         raise StdinNotImplementedError(\"raw_input was called, but this \"\n\u001b[0m\u001b[0;32m    446\u001b[0m                                        \"frontend does not support stdin.\") \n\u001b[0;32m    447\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
-        "\u001b[1;31mStdinNotImplementedError\u001b[0m: raw_input was called, but this frontend does not support stdin."
-       ]
-      },
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "Choose your car\n",
-        "S for Standard\n",
-        "L for Leather Seats\n",
-        "D for Leather Seats + Chrome Wheels\n"
-       ]
-      }
-     ],
-     "prompt_number": 1
+     "outputs": [],
+     "prompt_number": "*"
     },
     {
      "cell_type": "code",
diff --git a/C++_Demystified:_A_Self-Teaching_Guide/chapter9.ipynb b/C++_Demystified:_A_Self-Teaching_Guide/chapter9.ipynb
index 78228f18..5b5e1ccb 100755
--- a/C++_Demystified:_A_Self-Teaching_Guide/chapter9.ipynb
+++ b/C++_Demystified:_A_Self-Teaching_Guide/chapter9.ipynb
@@ -157,11 +157,12 @@
      "input": [
       "\n",
       "def printMessage():\n",
+      "    times = 0\n",
       "    times += 1\n",
       "    print \"This function called \", times, \" times\"\n",
       "\n",
       "\n",
-      "times = 0\n",
+      "\n",
       "choice = '1'\n",
       "while(choice != 'Q'):\n",
       "    print \"Enter Q to quit, any other character to continue: \",\n",
@@ -178,6 +179,22 @@
        "output_type": "stream",
        "stream": "stdout",
        "text": [
+        " Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "e\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  1  times\n",
         "Enter Q to quit, any other character to continue: "
        ]
       },
@@ -190,18 +207,46 @@
        ]
       },
       {
-       "ename": "UnboundLocalError",
-       "evalue": "local variable 'times' referenced before assignment",
-       "output_type": "pyerr",
-       "traceback": [
-        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mUnboundLocalError\u001b[0m                         Traceback (most recent call last)",
-        "\u001b[1;32m<ipython-input-8-42e131eb489c>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m     17\u001b[0m         \u001b[1;32mprint\u001b[0m \u001b[1;34m\"Input stopped\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     18\u001b[0m     \u001b[1;32melse\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 19\u001b[1;33m         \u001b[0mprintMessage\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
-        "\u001b[1;32m<ipython-input-8-42e131eb489c>\u001b[0m in \u001b[0;36mprintMessage\u001b[1;34m()\u001b[0m\n\u001b[0;32m      5\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mprintMessage\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 7\u001b[1;33m     \u001b[0mtimes\u001b[0m \u001b[1;33m+=\u001b[0m \u001b[1;36m1\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      8\u001b[0m     \u001b[1;32mprint\u001b[0m \u001b[1;34m\"This function called \"\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mtimes\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m\" times\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      9\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
-        "\u001b[1;31mUnboundLocalError\u001b[0m: local variable 'times' referenced before assignment"
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  1  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "q\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " This function called  1  times\n",
+        "Enter Q to quit, any other character to continue: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Q\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Input stopped\n"
        ]
       }
      ],
-     "prompt_number": 8
+     "prompt_number": 4
     },
     {
      "cell_type": "heading",
diff --git a/C++_Demystified:_A_Self-Teaching_Guide/students.dat b/C++_Demystified:_A_Self-Teaching_Guide/students.dat
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/C++_Demystified:_A_Self-Teaching_Guide/students.dat