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 "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": {}
  }
 ]
}