solved errors

6 files changed, 564 insertions, 65 deletions

diff --git a/Practical_C_Programming/.ipynb_checkpoints/Chapter_14_1-checkpoint.ipynb b/Practical_C_Programming/.ipynb_checkpoints/Chapter_14_1-checkpoint.ipynb
new file mode 100755
index 00000000..c25523b7
--- /dev/null
+++ b/Practical_C_Programming/.ipynb_checkpoints/Chapter_14_1-checkpoint.ipynb
@@ -0,0 +1,175 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:aaf3603d1f605477459dd54990dcc4c8c154c9c808805468e92c30fde9487343"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Chapter 14: File input/output"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 14.1, Page number: 253"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variable declaration\n",
+      "import os\n",
+      "count = 0\n",
+      "in_file = open ('input.txt', 'r')\n",
+      " \n",
+      "# Calculation and result\n",
+      "if not os.path.exists ('input.txt') :\n",
+      "   print ('Cannot open input.txt\\n')\n",
+      "\n",
+      "while (1) :\n",
+      "   ch = in_file.read(1)\n",
+      "   if not ch :\n",
+      "      break\n",
+      "   count += 1\n",
+      "\n",
+      "print ('Number of characters in input.txt is %d\\n' % count)\n",
+      "\n",
+      "in_file.close()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Number of characters in input.txt is 0\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 14.3, Page number: 257"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "# Variable declaration\n",
+      "import sys\n",
+      "import os\n",
+      "in_file = open ('input.txt', 'r')\n",
+      " \n",
+      "# Calculation and result\n",
+      "if not os.path.exists ('input.txt') :\n",
+      "   print ('Could not open file\\n')\n",
+      "   sys.exit(1)\n",
+      "print ('File found\\n')\n",
+      "\n",
+      "in_file.close()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "File found\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 14.4, Page number: 260"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variable declaration\n",
+      "import sys\n",
+      "import os\n",
+      "out_file = open ('test.out', 'w')\n",
+      " \n",
+      "# Calculation and result\n",
+      "if not os.path.exists ('test.out') :\n",
+      "   print ('Cannot open output file\\n')\n",
+      "   sys.exit(1)\n",
+      "\n",
+      "for cur_char in range (0, 128) :\n",
+      "   out_file.write(str (cur_char))\n",
+      "   out_file.write('\\n')\n",
+      "\n",
+      "out_file.close()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 14.5, Page number: 267"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "# Variable declaration\n",
+      "txt_file = open ('input.txt')\n",
+      "\n",
+      "source_content = txt_file.read()\n",
+      "\n",
+      "target = open ('output.txt', 'w')\n",
+      "\n",
+      "# Calculation and result\n",
+      "target.write(source_content)\n",
+      "print ('Content copied')\n",
+      "\n",
+      "target.close()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file
diff --git a/Practical_C_Programming/.ipynb_checkpoints/Chapter_15_1-checkpoint.ipynb b/Practical_C_Programming/.ipynb_checkpoints/Chapter_15_1-checkpoint.ipynb
new file mode 100755
index 00000000..05286d0f
--- /dev/null
+++ b/Practical_C_Programming/.ipynb_checkpoints/Chapter_15_1-checkpoint.ipynb
@@ -0,0 +1,351 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:23b3891085deb8af52412d44380b6187a4110d7e026531ec90b3b2ae79d61d0f"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 15: Debugging and optimization"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 15.1, Page number: 275"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Function declaration\n",
+      "def lookup (name) :\n",
+      "   lists = ['John', 'Jim', 'Jane', 'Clyde']\n",
+      "   result = 0\n",
+      "\n",
+      "   for index in range (0, 4) :\n",
+      "      if (lists[index] == name) :\n",
+      "         result = 1\n",
+      "         break\n",
+      "   \n",
+      "   return result\n",
+      "\n",
+      "# Calculation and result\n",
+      "name = 'John'\n",
+      "\n",
+      "if (lookup (name)) :\n",
+      "   print ('%s is in the list\\n' % name)\n",
+      "else :\n",
+      "   print ('%s is not in the list\\n' % name)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "John is in the list\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 15.6, Page number: 288"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variable and function declaration\n",
+      "seven_count = 0\n",
+      "three_count = 0\n",
+      "data = []\n",
+      "\n",
+      "def get_data (data) :\n",
+      "   for i in range (0, 5) :\n",
+      "      x = 3\n",
+      "      data.append(int(x))\n",
+      "   print (data)\n",
+      "\n",
+      "# Calculation\n",
+      "get_data (data)\n",
+      "for index in range (0, 5) :\n",
+      "   if data[index] == 3 :\n",
+      "      three_count += 1\n",
+      "\n",
+      "   if data[index] == 7 :\n",
+      "      seven_count += 1\n",
+      "\n",
+      "# Result\n",
+      "print ('Threes %d Sevens %d' % (three_count, seven_count))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "[3, 3, 3, 3, 3]\n",
+        "Threes 5 Sevens 0\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 15.7, Page number: 292"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variable declaration\n",
+      "import sys\n",
+      "import os\n",
+      "in_file = open ('numbers.dat', 'r')\n",
+      "\n",
+      "data = []\n",
+      "max_count = 0\n",
+      " \n",
+      "# Calculation and result\n",
+      "if not os.path.exists ('numbers.dat') :\n",
+      "   print ('Error:Unable to open numbers.dat\\n')\n",
+      "   sys.exit(1)\n",
+      "\n",
+      "for line in in_file :\n",
+      "   data.append(line)\n",
+      "   max_count += 1\n",
+      "\n",
+      "while (1) :\n",
+      "   search = 6\n",
+      "   \n",
+      "   if (search == -1) :\n",
+      "      break\n",
+      "\n",
+      "   low = 0\n",
+      "   high = max_count\n",
+      "\n",
+      "   while (1) :\n",
+      "      mid = (low + high) / 2\n",
+      "      middle = int (mid)      \n",
+      "\n",
+      "      if (int (data[middle]) == search) :\n",
+      "         print ('Found at index %d\\n' % (middle + 1))\n",
+      "         break\n",
+      "\n",
+      "      if (low == high) :\n",
+      "         print ('Not found\\n')\n",
+      "         break\n",
+      "\n",
+      "      if (int (data[middle]) < search) :\n",
+      "         low = middle\n",
+      "      else :\n",
+      "         high = middle      \n",
+      "\n",
+      "in_file.close()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": "*"
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 15.8, Page number: 300"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "# Variable declaration\n",
+      "import sys\n",
+      "import os\n",
+      "in_file = open ('numbers.dat', 'r')\n",
+      "\n",
+      "data = []\n",
+      "max_count = 0\n",
+      " \n",
+      "# Calculation and result\n",
+      "if not os.path.exists ('numbers.dat') :\n",
+      "   print ('Error:Unable to open numbers.dat\\n')\n",
+      "   sys.exit(1)\n",
+      "\n",
+      "for line in in_file :\n",
+      "   data.append(line)\n",
+      "   max_count += 1\n",
+      "\n",
+      "while (1) :\n",
+      "   search = 14\n",
+      "   \n",
+      "   if (search == -1) :\n",
+      "      break\n",
+      "\n",
+      "   low = 0\n",
+      "   high = max_count\n",
+      "\n",
+      "   while (1) :\n",
+      "      mid = (low + high) / 2\n",
+      "      middle = int (mid)      \n",
+      "\n",
+      "      if (int (data[middle]) == search) :\n",
+      "         print ('Found at index %d\\n' % (middle + 1))\n",
+      "         break\n",
+      "\n",
+      "      if (low == high) :\n",
+      "         print ('Not found\\n')\n",
+      "         break\n",
+      "\n",
+      "      if (int (data[middle]) < search) :\n",
+      "         low = middle\n",
+      "      else :\n",
+      "         high = middle      \n",
+      "\n",
+      "in_file.close()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": "*"
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 15.10, Page number: 304"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variable declaration\n",
+      "i = 1\n",
+      "j = 1\n",
+      "\n",
+      "# Calculation and result\n",
+      "print ('Starting\\n')\n",
+      "print ('Before divide...')\n",
+      "i = i / j\n",
+      "print ('After\\n')"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Starting\n",
+        "\n",
+        "Before divide...\n",
+        "After\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 15.11, Page number: 304"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "# Variable declaration\n",
+      "import sys\n",
+      "i = 1\n",
+      "j = 1\n",
+      "\n",
+      "# Calculation and result\n",
+      "print ('Starting\\n')\n",
+      "sys.stdout.flush()\n",
+      "print ('Before divide...')\n",
+      "sys.stdout.flush()\n",
+      "i = i / j\n",
+      "print ('After\\n')\n",
+      "sys.stdout.flush()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Starting\n",
+        "\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Before divide...\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "After\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file
diff --git a/Practical_C_Programming/Chapter_14_1.ipynb b/Practical_C_Programming/Chapter_14_1.ipynb
index 6d3c736e..c25523b7 100755
--- a/Practical_C_Programming/Chapter_14_1.ipynb
+++ b/Practical_C_Programming/Chapter_14_1.ipynb
@@ -52,17 +52,15 @@
      "metadata": {},
      "outputs": [
       {
-       "ename": "IOError",
-       "evalue": "[Errno 2] No such file or directory: 'input.txt'",
-       "output_type": "pyerr",
-       "traceback": [
-        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mIOError\u001b[0m                                   Traceback (most recent call last)",
-        "\u001b[1;32m<ipython-input-1-038814efe2a7>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0mos\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      7\u001b[0m \u001b[0mcount\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;36m0\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m \u001b[0min_file\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mopen\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'input.txt'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'r'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      9\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     10\u001b[0m \u001b[1;31m# Calculation and result\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
-        "\u001b[1;31mIOError\u001b[0m: [Errno 2] No such file or directory: 'input.txt'"
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Number of characters in input.txt is 0\n",
+        "\n"
        ]
       }
      ],
-     "prompt_number": 1
+     "prompt_number": 2
     },
     {
      "cell_type": "heading",
@@ -84,7 +82,7 @@
       "in_file = open ('input.txt', 'r')\n",
       " \n",
       "# Calculation and result\n",
-      "if not os.path.exists (name) :\n",
+      "if not os.path.exists ('input.txt') :\n",
       "   print ('Could not open file\\n')\n",
       "   sys.exit(1)\n",
       "print ('File found\\n')\n",
@@ -95,17 +93,15 @@
      "metadata": {},
      "outputs": [
       {
-       "ename": "IOError",
-       "evalue": "[Errno 2] No such file or directory: 'input.txt'",
-       "output_type": "pyerr",
-       "traceback": [
-        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mIOError\u001b[0m                                   Traceback (most recent call last)",
-        "\u001b[1;32m<ipython-input-2-370dc09ecbc3>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0msys\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      7\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0mos\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m \u001b[0min_file\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mopen\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'input.txt'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'r'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      9\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     10\u001b[0m \u001b[1;31m# Calculation and result\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
-        "\u001b[1;31mIOError\u001b[0m: [Errno 2] No such file or directory: 'input.txt'"
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "File found\n",
+        "\n"
        ]
       }
      ],
-     "prompt_number": 2
+     "prompt_number": 5
     },
     {
      "cell_type": "heading",
diff --git a/Practical_C_Programming/Chapter_15_1.ipynb b/Practical_C_Programming/Chapter_15_1.ipynb
index 34a86a67..05286d0f 100755
--- a/Practical_C_Programming/Chapter_15_1.ipynb
+++ b/Practical_C_Programming/Chapter_15_1.ipynb
@@ -173,19 +173,8 @@
      ],
      "language": "python",
      "metadata": {},
-     "outputs": [
-      {
-       "ename": "IOError",
-       "evalue": "[Errno 2] No such file or directory: 'numbers.dat'",
-       "output_type": "pyerr",
-       "traceback": [
-        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mIOError\u001b[0m                                   Traceback (most recent call last)",
-        "\u001b[1;32m<ipython-input-5-ce867c3a4ec5>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0msys\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      7\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0mos\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m \u001b[0min_file\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mopen\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'numbers.dat'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'r'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      9\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     10\u001b[0m \u001b[0mdata\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;31mIOError\u001b[0m: [Errno 2] No such file or directory: 'numbers.dat'"
-       ]
-      }
-     ],
-     "prompt_number": 5
+     "outputs": [],
+     "prompt_number": "*"
     },
     {
      "cell_type": "heading",
@@ -248,19 +237,8 @@
      ],
      "language": "python",
      "metadata": {},
-     "outputs": [
-      {
-       "ename": "IOError",
-       "evalue": "[Errno 2] No such file or directory: 'numbers.dat'",
-       "output_type": "pyerr",
-       "traceback": [
-        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mIOError\u001b[0m                                   Traceback (most recent call last)",
-        "\u001b[1;32m<ipython-input-6-8cd3b79f72a3>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0msys\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      7\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0mos\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m \u001b[0min_file\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mopen\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'numbers.dat'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'r'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      9\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     10\u001b[0m \u001b[0mdata\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;31mIOError\u001b[0m: [Errno 2] No such file or directory: 'numbers.dat'"
-       ]
-      }
-     ],
-     "prompt_number": 6
+     "outputs": [],
+     "prompt_number": "*"
     },
     {
      "cell_type": "heading",
@@ -277,7 +255,7 @@
       "\n",
       "# Variable declaration\n",
       "i = 1\n",
-      "j = 0\n",
+      "j = 1\n",
       "\n",
       "# Calculation and result\n",
       "print ('Starting\\n')\n",
@@ -289,26 +267,18 @@
      "metadata": {},
      "outputs": [
       {
-       "ename": "ZeroDivisionError",
-       "evalue": "integer division or modulo by zero",
-       "output_type": "pyerr",
-       "traceback": [
-        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
-        "\u001b[1;32m<ipython-input-7-289ff2a55d4d>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m     10\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'Starting\\n'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     11\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'Before divide...'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 12\u001b[1;33m \u001b[0mi\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mi\u001b[0m \u001b[1;33m/\u001b[0m \u001b[0mj\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m     13\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'After\\n'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
-        "\u001b[1;31mZeroDivisionError\u001b[0m: integer division or modulo by zero"
-       ]
-      },
-      {
        "output_type": "stream",
        "stream": "stdout",
        "text": [
         "Starting\n",
         "\n",
-        "Before divide...\n"
+        "Before divide...\n",
+        "After\n",
+        "\n"
        ]
       }
      ],
-     "prompt_number": 7
+     "prompt_number": 9
     },
     {
      "cell_type": "heading",
@@ -322,11 +292,11 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "\n",
+      "from __future__ import division\n",
       "# Variable declaration\n",
       "import sys\n",
       "i = 1\n",
-      "j = 0\n",
+      "j = 1\n",
       "\n",
       "# Calculation and result\n",
       "print ('Starting\\n')\n",
@@ -356,17 +326,23 @@
        ]
       },
       {
-       "ename": "ZeroDivisionError",
-       "evalue": "integer division or modulo by zero",
-       "output_type": "pyerr",
-       "traceback": [
-        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
-        "\u001b[1;32m<ipython-input-8-eedd2fda3e82>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m     13\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'Before divide...'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     14\u001b[0m \u001b[0msys\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mstdout\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mflush\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 15\u001b[1;33m \u001b[0mi\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mi\u001b[0m \u001b[1;33m/\u001b[0m \u001b[0mj\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m     16\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'After\\n'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     17\u001b[0m \u001b[0msys\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mstdout\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mflush\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
-        "\u001b[1;31mZeroDivisionError\u001b[0m: integer division or modulo by zero"
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "After\n",
+        "\n"
        ]
       }
      ],
      "prompt_number": 8
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
     }
    ],
    "metadata": {}
diff --git a/Practical_C_Programming/numbers.dat b/Practical_C_Programming/numbers.dat
new file mode 100644
index 00000000..573541ac
--- /dev/null
+++ b/Practical_C_Programming/numbers.dat
@@ -0,0 +1 @@
+0
diff --git a/Practical_C_Programming/numbers.dat~ b/Practical_C_Programming/numbers.dat~
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/Practical_C_Programming/numbers.dat~