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+{
+ "metadata": {
+ "name": "chapter4.ipynb"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "CHAPTER 4: THE CASE CONTROL STRUCTURE"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:126"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Switch case statement using dictionary\n",
+ "i=2\n",
+ "def switch(i):\n",
+ " return {True: 'I am in default\\n', #default case\n",
+ " i==1: 'I am in case1\\n',\n",
+ " i==2: 'I am in case2\\n',\n",
+ " i==3: 'I am in case3\\n',\n",
+ " }[True]\n",
+ "print switch(i)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "I am in case2\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:128"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Switch case using scrambled case order\n",
+ "i=22\n",
+ "def switch(i):\n",
+ " return{True: 'I am in default\\n',\n",
+ " i==121: 'I am in case 121\\n',\n",
+ " i==7: 'I am in case 7\\n',\n",
+ " i==22: 'I am in case 22\\n',\n",
+ " }[True]\n",
+ "print switch(i)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "I am in case 22\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:128-129"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Switch case using char values in case\n",
+ "c='x'\n",
+ "def switch(c):\n",
+ " return {True: 'I am in default\\n',\n",
+ " c=='v': 'I am in case v\\n',\n",
+ " c=='a': 'I am in case a\\n',\n",
+ " c=='x': 'I am in case x\\n',\n",
+ " }[True]\n",
+ "print switch(c)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "I am in case x\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:129-130"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Executing common set of statements for multiple cases\n",
+ "print \"Enter any one of the alphabets a,b,or c\"\n",
+ "ch=raw_input()\n",
+ "def casea():\n",
+ " print \"\"\n",
+ "def caseb():\n",
+ " print \"\"\n",
+ "def casec():\n",
+ " print \"\"\n",
+ "def switch(ch):\n",
+ " return {True: 'wish you knew what are alphabets\\n',\n",
+ " ch=='a' or ch=='A': 'a as in ashar\\n',\n",
+ " ch=='b' or ch=='B': 'b as in brain\\n',\n",
+ " ch=='c' or ch=='C': 'c as in cookie\\n',\n",
+ " }[True]\n",
+ "print switch(ch)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter any one of the alphabets a,b,or c\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "B\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "b as in brain\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:130"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Iniatialisation according to cases\n",
+ "print \"Enter value of i\"\n",
+ "i=eval(raw_input())\n",
+ "def switch(i):\n",
+ " print \"Hello\\n\" #It's python,not C :)\n",
+ " try:\n",
+ " return {1: a,\n",
+ " 2: b,\n",
+ " }[i]()\n",
+ " except:\n",
+ " print \"wrong choice\" #print message in default case\n",
+ "def a():\n",
+ " j=10\n",
+ " print j #print j as 10 if i=1\n",
+ "def b():\n",
+ " j=20 \n",
+ " print j #print j as 20 if i=2\n",
+ "switch(i)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter value of i\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Hello\n",
+ "\n",
+ "10\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:133"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Conditional printing of messages\n",
+ "import sys\n",
+ "print \"Enter the number of goals scored against india\"\n",
+ "goals=eval(raw_input())\n",
+ "if goals<=5:\n",
+ " print \"To err is human!\\n\"\n",
+ "else:\n",
+ " print \"About time soccer players learnt C\\n\"\n",
+ " print \"and said goodbye! adieu! to soccer\\n\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number of goals scored against india\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "7\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "About time soccer players learnt C\n",
+ "\n",
+ "and said goodbye! adieu! to soccer\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 11
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:134-135"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Program to conditional print of numbers\n",
+ "for i in range(1,4,1):\n",
+ " for j in range(1,4,1):\n",
+ " for k in range(1,4,1):\n",
+ " if (i==3 and j==3 and k==3):\n",
+ " print \"Out of the loop at last!\\n\"\n",
+ " else:\n",
+ " print \"%d %d %d\\n\" % (i,j,k)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1 1 1\n",
+ "\n",
+ "1 1 2\n",
+ "\n",
+ "1 1 3\n",
+ "\n",
+ "1 2 1\n",
+ "\n",
+ "1 2 2\n",
+ "\n",
+ "1 2 3\n",
+ "\n",
+ "1 3 1\n",
+ "\n",
+ "1 3 2\n",
+ "\n",
+ "1 3 3\n",
+ "\n",
+ "2 1 1\n",
+ "\n",
+ "2 1 2\n",
+ "\n",
+ "2 1 3\n",
+ "\n",
+ "2 2 1\n",
+ "\n",
+ "2 2 2\n",
+ "\n",
+ "2 2 3\n",
+ "\n",
+ "2 3 1\n",
+ "\n",
+ "2 3 2\n",
+ "\n",
+ "2 3 3\n",
+ "\n",
+ "3 1 1\n",
+ "\n",
+ "3 1 2\n",
+ "\n",
+ "3 1 3\n",
+ "\n",
+ "3 2 1\n",
+ "\n",
+ "3 2 2\n",
+ "\n",
+ "3 2 3\n",
+ "\n",
+ "3 3 1\n",
+ "\n",
+ "3 3 2\n",
+ "\n",
+ "Out of the loop at last!\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 12
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-20 12:48:49 +0000