{
 "metadata": {
  "name": "",
  "signature": "sha256:d985967b3e8d0e583d78d0a3306851320f330cc48579a1f62da314746570750f"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 4 Looping Structures"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.1 , Page No.88"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "x=0\n",
      "print \"The value of x is \",x\n",
      "x+=1\n",
      "print \"The value of x is \",x"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The value of x is  0\n",
        "The value of x is  1\n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.2, Page No.89"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "x=0\n",
      "y=0\n",
      "print \"The value of y is \", y+1\n",
      "print \"The value of x is \", x+1"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The value of y is  1\n",
        "The value of x is  1\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.3, Page No.89"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "x=0\n",
      "y=1\n",
      "x=(y)*2\n",
      "print \"The Value of x \",x\n",
      "x=0\n",
      "y=1\n",
      "x=(y+1)*2\n",
      "print \"The Value of x \",x"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The Value of x  2\n",
        "The Value of x  4\n"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.4, Page No.90"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "x=0\n",
      "y=0\n",
      "x=(y)*4\n",
      "print \"The Value of x\", x\n",
      "y=0\n",
      "x=(y+1)*4\n",
      "print \"The Value of x\", x"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The Value of x 0\n",
        "The Value of x 4\n"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.5, Page No.92"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "x=1\n",
      "y=1\n",
      "x=(y)*4\n",
      "print \"The value of x is \",x\n",
      "y=1\n",
      "x=(y-1)*4\n",
      "print \"The value of x is \",x"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The value of x is  4\n",
        "The value of x is  0\n"
       ]
      }
     ],
     "prompt_number": 7
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.6, Page No. 93"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "x=1\n",
      "y=2\n",
      "x=y*x+1\n",
      "print \"The value of x is: \",x\n",
      "x=1\n",
      "y=2\n",
      "x+=y*x+1\n",
      "print \"The value of x is: \",x"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The value of x is:  3\n",
        "The value of x is:  4\n"
       ]
      }
     ],
     "prompt_number": 8
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.7, Page No.94"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "x=1\n",
      "y=2\n",
      "x=y*x+1\n",
      "print \"The value of x is: \",x\n",
      "x=1\n",
      "y=2\n",
      "x-=y*x+1\n",
      "print \"The value of x is: \",x"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The value of x is:  3\n",
        "The value of x is:  -2\n"
       ]
      }
     ],
     "prompt_number": 9
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.8, Page No.95"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "x=0\n",
      "while (x<10):\n",
      "    print \"The value of x is \",x\n",
      "    x=x+1"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The value of x is  0\n",
        "The value of x is  1\n",
        "The value of x is  2\n",
        "The value of x is  3\n",
        "The value of x is  4\n",
        "The value of x is  5\n",
        "The value of x is  6\n",
        "The value of x is  7\n",
        "The value of x is  8\n",
        "The value of x is  9\n"
       ]
      }
     ],
     "prompt_number": 11
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.9, Page No.97"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "iSelection=0\n",
      "while (iSelection!=4):\n",
      "    print \"1\\tDeposit Funds\"\n",
      "    print \"2\\tWithdraw Funds\"\n",
      "    print \"3\\tPrint Balance\"\n",
      "    print \"4\\tQuit\"\n",
      "    iSelection=int(raw_input(\"Enter Your Selection(1-4): \"))\n",
      "print \"Thank you\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "1\tDeposit Funds\n",
        "2\tWithdraw Funds\n",
        "3\tPrint Balance\n",
        "4\tQuit\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter Your Selection(1-4): 1\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "1\tDeposit Funds\n",
        "2\tWithdraw Funds\n",
        "3\tPrint Balance\n",
        "4\tQuit\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter Your Selection(1-4): 4\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Thank you\n"
       ]
      }
     ],
     "prompt_number": 13
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.10, Page No.99"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "x=9\n",
      "while (x<10):\n",
      "    print \"This printf statement is executed at least once\"\n",
      "    x=x+1\n",
      "while (x<10):\n",
      "    print \"This printf statement is never executed \"\n",
      "    x=x+1"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "This printf statement is executed at least once\n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.11, Page No.100"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for x in range(10,5,-1):\n",
      "    print \"The value of x is \",x"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The value of x is  10\n",
        "The value of x is  9\n",
        "The value of x is  8\n",
        "The value of x is  7\n",
        "The value of x is  6\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.12, Page No.101"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import random\n",
      "iNumQuestions=int(raw_input(\"Enter the number of questions to ask: \"))\n",
      "for x in range(iNumQuestions):\n",
      "    iRndNum1=(random.randint(0,100)%10)+1\n",
      "    iRndNum2=(random.randint(0,100)%10)+1\n",
      "    iResponse=int(raw_input(\"what is \"+ str(iRndNum1)+\" * \"+str(iRndNum2)+\" : \"))\n",
      "    if(iResponse==(iRndNum1*iRndNum2)):\n",
      "        print \"Correct\"\n",
      "    else:\n",
      "        print \"The Corrent answer was \", iRndNum1*iRndNum2"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter the number of questions to ask: 2\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "what is 6 * 9 : 54\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Correct\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "what is 8 * 5 : 32\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The Corrent answer was  40\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.13, Page No.102"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for x in range(10,5,-1):\n",
      "    if x==7:\n",
      "        break\n",
      "print x"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "7\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.14, Page No.103"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for x in range(10,5,-1):\n",
      "    if x==7:\n",
      "        continue\n",
      "    print x"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "10\n",
        "9\n",
        "8\n",
        "6\n"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.15, Page No.104"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for x in range(25):\n",
      "    print \"\\n\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 4.16, Page No. 106"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import time\n",
      "import random\n",
      "import os\n",
      "cYesNo=raw_input(\"Play a game of Concentration?(y or n)\")\n",
      "if(cYesNo=='y' or cYesNo=='Y'):\n",
      "    i1=random.randint(0,100) % 100\n",
      "    i2=random.randint(0,100) % 100\n",
      "    i3=random.randint(0,100) % 100\n",
      "    print \"Concentrate on the next three numbers\\n\",i1,i2,i3\n",
      "    iCurrentTime=int(round(time.time()*1000))\n",
      "    iElapsedTime=int(round(time.time()*1000))\n",
      "    while((iCurrentTime-iElapsedTime)<3):\n",
      "        iElapsedTime=int(round(time.time()*1000))\n",
      "    os.system('cls')\n",
      "    iResp1=int(raw_input(\"Enter a number:\"))\n",
      "    iResp2=int(raw_input(\"Enter a number:\"))\n",
      "    iResp3=int(raw_input(\"Enter a number:\"))\n",
      "    \n",
      "    if(i1==iResp1 and i2==iResp2 and i3==iResp3):\n",
      "        print \"Congratulations!\"\n",
      "    else:\n",
      "        print \"Sorry, Correct numbers were \",i1,i2,i3"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Play a game of Concentration?(y or n)n\n"
       ]
      }
     ],
     "prompt_number": 1
    }
   ],
   "metadata": {}
  }
 ]
}