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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:afd37f358b4faba0dd82fd8fdf176be8389b2a27c7cdec9882b3da534d4a3ec8"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 4: Control Structures"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example if1.c, page no. 101"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "i = int(raw_input(\"Enter a number: \")) \n",
+ "if i % 3 == 0 :\n",
+ " print \"Number entered is divisible by 3.\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter a number: 30\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Number entered is divisible by 3.\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example scanf8.c, page no. 102"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#The output in the textbok is 0.000000 because it was not able to convert string to float in C\n",
+ "#Hence, by default it stored 0.0000000. In Python the same would give error. Hence, the answer differs\n",
+ "\n",
+ "years = float(raw_input(\"Input your age in years: \"))\n",
+ "secs = years * 365 * 24 * 60 * 60\n",
+ "print \"You have livid for %f seconds \" %secs"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input your age in years: 25\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "You have livid for 788400000.000000 seconds \n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example if2.c, page no. 102"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#the way it is given in textbook is not possible in Python. Doing it in different manner\n",
+ "\n",
+ "print \"Input your age in years: \",\n",
+ "years =(raw_input())\n",
+ "try:\n",
+ " float(years)\n",
+ " secs = float(years) * 365 * 24 * 60 * 60\n",
+ " print \"you have lived for %f seconds\" %secs\n",
+ "except:\n",
+ " print \"the input is not a floating-point number\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input your age in years: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "75\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " you have lived for 2365200000.000000 seconds\n"
+ ]
+ }
+ ],
+ "prompt_number": 20
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example if3.c, page no. 103"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#the program will remain same as the previous one\n",
+ "\n",
+ "print \"Input your age in years: \",\n",
+ "years =(raw_input())\n",
+ "try:\n",
+ " float(years)\n",
+ " secs = float(years) * 365 * 24 * 60 * 60\n",
+ " print \"you have lived for %f seconds\" %secs\n",
+ "except:\n",
+ " print \"the input is not a floating-point number\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input your age in years: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "sundeep\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " the input is not a floating-point number\n"
+ ]
+ }
+ ],
+ "prompt_number": 21
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example large.c, page no. 105"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "print \"Input a b c\"\n",
+ "a = float(raw_input(\"a=\"))\n",
+ "b = float(raw_input(\"b=\"))\n",
+ "c = float(raw_input(\"c=\"))\n",
+ "big = a\n",
+ "if b>big :\n",
+ " big = b\n",
+ "if c>big :\n",
+ " big = c\n",
+ "print \"Largest of the three numbers = %7.2f\" %big"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input a b c\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "a=10\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "b=20\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "c=45\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Largest of the three numbers = 45.00\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example ifelse1.c, page no. 105"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#the program will remain same as the previous one\n",
+ "\n",
+ "print \"Input your age in years: \",\n",
+ "years =(raw_input())\n",
+ "try:\n",
+ " float(years)\n",
+ " secs = float(years) * 365 * 24 * 60 * 60\n",
+ " print \"you have lived for %f seconds\" %secs\n",
+ "except:\n",
+ " print \"the input is not a floating-point number\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input your age in years: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "100\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " you have lived for 3153600000.000000 seconds\n"
+ ]
+ }
+ ],
+ "prompt_number": 22
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example ifelse2.c, page no. 107"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "input1 = int(raw_input(\"Input an integer: \"))\n",
+ "if input1 :\n",
+ " print \"It is non-zero.\"\n",
+ "else :\n",
+ " print \"it is zero.\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input an integer: 12\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "It is non-zero.\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example scope.c, page no. 112"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#The block given in the textbook is not possible in Python. Here the value will remain the same.\n",
+ "\n",
+ "i = 10\n",
+ "print \"In main. i is %d \" %i\n",
+ "i = 20\n",
+ "print \"In compound statement. i is %d\" %i\n",
+ "i = i+1\n",
+ "print \"After incrementing: i is %d\" %i\n",
+ "print \"In main again. i is %d\" %i"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "In main. i is 10 \n",
+ "In compound statement. i is 20\n",
+ "After incrementing: i is 21\n",
+ "In main again. i is 21\n"
+ ]
+ }
+ ],
+ "prompt_number": 23
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example for.c, page no. 113"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "for i in range(1, 11):\n",
+ " print i*5,"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "5 10 15 20 25 30 35 40 45 50\n"
+ ]
+ }
+ ],
+ "prompt_number": 26
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example sumsq1.c, page no. 115"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "sum = 0\n",
+ "sum_of_squares = 0\n",
+ "for i in range(2, 31, 2):\n",
+ " sum += i\n",
+ " sum_of_squares += i*i\n",
+ "print \"Sum of first 15 positive even numbers = \", sum\n",
+ "print \"Sum of their squares = \", sum_of_squares"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Sum of first 15 positive even numbers = 240\n",
+ "Sum of their squares = 4960\n"
+ ]
+ }
+ ],
+ "prompt_number": 27
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example sumsq2.c, page no. 116"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "sum = 0\n",
+ "sum_of_squares = 0\n",
+ "for i in range(30, 1, -2):\n",
+ " sum += i\n",
+ " sum_of_squares += i*i\n",
+ "print \"Sum of first 15 positive even numbers = \", sum\n",
+ "print \"Sum of their squares = \", sum_of_squares"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Sum of first 15 positive even numbers = 240\n",
+ "Sum of their squares = 4960\n"
+ ]
+ }
+ ],
+ "prompt_number": 29
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example for2.c, page no. 116"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "for i in range(1, 11):\n",
+ " print 5*i,"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "5 10 15 20 25 30 35 40 45 50\n"
+ ]
+ }
+ ],
+ "prompt_number": 30
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.1, page no. 117"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#error in textbook, i should be initialized by 1\n",
+ "\n",
+ "sign = 1\n",
+ "print \"Input X and N: \"\n",
+ "x = float(raw_input(\"X: \"))\n",
+ "n = int(raw_input(\"N: \"))\n",
+ "x *= 3.1412/180.0\n",
+ "sum, t = x, x\n",
+ "for i in range(1, n):\n",
+ " sign *=-1\n",
+ " t = sign * x * x / (2*i*(2*i+1))\n",
+ " sum += t\n",
+ "print \"SIN(X) = %6.2f\" %sum"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input X and N: \n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "X: 60\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "N: 12\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "SIN(X) = 0.90\n"
+ ]
+ }
+ ],
+ "prompt_number": 33
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.2, page no. 118"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "num = 0\n",
+ "sum = 0\n",
+ "print \"Input the marks, -1 at the end\"\n",
+ "i = int(raw_input())\n",
+ "while i != -1:\n",
+ " sum += i\n",
+ " num += 1\n",
+ " i = int(raw_input())\n",
+ "average = sum / num\n",
+ "print \"The average is %.2f\" %average"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input the marks, -1 at the end\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "12\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "14\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "16\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "18\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "-1\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The average is 15.00\n"
+ ]
+ }
+ ],
+ "prompt_number": 34
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example binary.c, page no. 120"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "binary = raw_input(\"Input the binary number: \")\n",
+ "decimal = int(binary, 2)\n",
+ "print \"The decimal equivalent of binary number %s is %d\" %(binary, decimal)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input the binary number: 1101\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The decimal equivalent of binary number 1101 is 13\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example dowhile.c, page no. 122"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#there is no do while loop in Python. We will use simple while loop\n",
+ "inchar = ''\n",
+ "while(inchar != 'y' and inchar != 'n'):\n",
+ " inchar = raw_input(\"Input y or n: \")\n",
+ "if inchar == 'y':\n",
+ " print \"you pressed y.\"\n",
+ "if inchar == 'n':\n",
+ " print \"you pressed n\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input y or n: j\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input y or n: j\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input y or n: n\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "you pressed n\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.4, page no. 123"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "num = int(raw_input(\"Input the number: \"))\n",
+ "n = num\n",
+ "sum = 0\n",
+ "rev = 0\n",
+ "while(num != 0):\n",
+ " digit = num % 10\n",
+ " sum += digit\n",
+ " rev = rev * 10 + digit\n",
+ " num /= 10\n",
+ "print \"Sum of the digits of the number = %4d\" %sum\n",
+ "print \"Reverse of the number = %7d\" %rev\n",
+ "if n == rev:\n",
+ " print \"The number is a palindrome\"\n",
+ "else:\n",
+ " print \"The number is not a palindrome\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input the number: 1221\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Sum of the digits of the number = 6\n",
+ "Reverse of the number = 1221\n",
+ "The number is a palindrome\n"
+ ]
+ }
+ ],
+ "prompt_number": 11
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example iflese.c, page no. 127"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "print \"Choice of destinations: \"\n",
+ "print \"\\t1 - Mercury\"\n",
+ "print \"\\t2 - Venus\"\n",
+ "print \"\\t3 - Mars\"\n",
+ "choice = int(raw_input(\"Enter the number corresponding to your choice: \"))\n",
+ "if choice == 1:\n",
+ " print \"Mercury is closest to the sun.\"\n",
+ " print \"So the weather may be quite hot there.\"\n",
+ " print \"The journey will cost you 5200 IGCs.\"\n",
+ "elif choice == 2:\n",
+ " print \"Venus is the second planet from the sun.\"\n",
+ " print \"The weather may be hot and poisonous.\"\n",
+ " print \"The journey will cost you 3200 IGCs.\"\n",
+ "elif choice == 3:\n",
+ " print \"Mars is the closest planet to the earth.\"\n",
+ " print \"The weather has been excellent till now.\"\n",
+ " print \"The journey will cost you 1200 IGCs.\"\n",
+ "else:\n",
+ " \"Unknown destination. Unpredictable IGCs\"\n",
+ "print \"Note: IGC = Ingeer-Galactic Currency\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Choice of destinations: \n",
+ "\t1 - Mercury\n",
+ "\t2 - Venus\n",
+ "\t3 - Mars\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number corresponding to your choice: 2\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Venus is the second planet from the sun.\n",
+ "The weather may be hot and poisonous.\n",
+ "The journey will cost you 3200 IGCs.\n",
+ "Note: IGC = Ingeer-Galactic Currency\n"
+ ]
+ }
+ ],
+ "prompt_number": 12
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.5, page no. 128"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#there is no switch case in Python, hence, no use of break in if conditions. So, the program will remain same\n",
+ "\n",
+ "print \"Choice of destinations: \"\n",
+ "print \"\\t1 - Mercury\"\n",
+ "print \"\\t2 - Venus\"\n",
+ "print \"\\t3 - Mars\"\n",
+ "choice = int(raw_input(\"Enter the number corresponding to your choice: \"))\n",
+ "if choice == 1:\n",
+ " print \"Mercury is closest to the sun.\"\n",
+ " print \"So the weather may be quite hot there.\"\n",
+ " print \"The journey will cost you 5200 IGCs.\"\n",
+ "elif choice == 2:\n",
+ " print \"Venus is the second planet from the sun.\"\n",
+ " print \"The weather may be hot and poisonous.\"\n",
+ " print \"The journey will cost you 3200 IGCs.\"\n",
+ "elif choice == 3:\n",
+ " print \"Mars is the closest planet to the earth.\"\n",
+ " print \"The weather has been excellent till now.\"\n",
+ " print \"The journey will cost you 1200 IGCs.\"\n",
+ "else:\n",
+ " \"Unknown destination. Unpredictable IGCs\"\n",
+ "print \"Note: IGC = Ingeer-Galactic Currency\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Choice of destinations: \n",
+ "\t1 - Mercury\n",
+ "\t2 - Venus\n",
+ "\t3 - Mars\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number corresponding to your choice: 3\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Mars is the closest planet to the earth.\n",
+ "The weather has been excellent till now.\n",
+ "The journey will cost you 1200 IGCs.\n",
+ "Note: IGC = Ingeer-Galactic Currency\n"
+ ]
+ }
+ ],
+ "prompt_number": 14
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.6, page no. 130"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "print \"Input a b & c\"\n",
+ "a = float(raw_input(\"a: \"))\n",
+ "b = float(raw_input(\"b: \"))\n",
+ "c = float(raw_input(\"c: \"))\n",
+ "if a != 0:\n",
+ " disc = b * b - 4 * a * c\n",
+ " print \"Discriminant = %5.2f\" %disc\n",
+ " if disc < 0:\n",
+ " k = 1\n",
+ " elif disc == 0:\n",
+ " k = 2\n",
+ " elif disc > 0:\n",
+ " k = 3\n",
+ " if k == 1:\n",
+ " print \"Roots are imaginary\"\n",
+ " real = -b/(2*a)\n",
+ " disc = -disc\n",
+ " num = pow(disc, 0.5)\n",
+ " imag = num/(2*a)\n",
+ " print \"Root1 = %5.2f +j %5.2f\" %(real, imag)\n",
+ " print \"Root2 = %5.2f -j %5.2f\" %(real, imag)\n",
+ " elif k == 2:\n",
+ " print \"Roots are real equal\"\n",
+ " root1 = -b/(2*a)\n",
+ " print \"Root1 = Root2 = %7.2f\" %root1\n",
+ " elif k == 3:\n",
+ " print \"Roots are real and unequal\"\n",
+ " root1 = (-b + sqrt(disc))/(2*a)\n",
+ " root2 = (-b - sqrt(disc))/(2*a)\n",
+ " print \"Root1 = %7.2f Root2 = %7.2f\" %(root1, root2)\n",
+ "else:\n",
+ " print \"Equation is linear\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input a b & c\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "a: 1\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "b: 2\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "c: 7\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Discriminant = -24.00\n",
+ "Roots are imaginary\n",
+ "Root1 = -1.00 +j 2.45\n",
+ "Root2 = -1.00 -j 2.45\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.7, page no. 132"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "sum = 0\n",
+ "for i in range(5):\n",
+ " num = int(raw_input(\"Enter an integer: \"))\n",
+ " if num < 0:\n",
+ " print \"You have entered a negative number\"\n",
+ " continue\n",
+ " sum += num\n",
+ "print \"The sum of positive integers entered = \", sum"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter an integer: 10\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter an integer: -15\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "You have entered a negative number\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter an integer: 15\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter an integer: -100\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "You have entered a negative number\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter an integer: 30\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The sum of positive integers entered = 55\n"
+ ]
+ }
+ ],
+ "prompt_number": 28
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.8, page no. 133"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "print \"Input X & N\"\n",
+ "x = float(raw_input(\"X: \"))\n",
+ "n = int(raw_input(\"N: \"))\n",
+ "t = 1\n",
+ "sum = 1\n",
+ "for i in range(1, n):\n",
+ " ifact = i\n",
+ " t = t*x/ifact\n",
+ " sum +=t\n",
+ "print \"E raies to power x = %10.4f\" %sum"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input X & N\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "X: 1.00\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "N: 2\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "E raies to power x = 2.0000\n"
+ ]
+ }
+ ],
+ "prompt_number": 31
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.9, page no. 134"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "n = int(raw_input(\"Enter the number: \"))\n",
+ "if n == 0:\n",
+ " print \"The factorial of 0 is 1\"\n",
+ "else:\n",
+ " fact = 1\n",
+ " for i in range(1, n+1):\n",
+ " fact = fact * i\n",
+ " print \"Factorial of %4d is %5d\" %(n, fact)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number: 5\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Factorial of 5 is 120\n"
+ ]
+ }
+ ],
+ "prompt_number": 33
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.10, page no. 135"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "binom = 1\n",
+ "q = 0\n",
+ "p = int(raw_input(\"Input the number of rows: \"))\n",
+ "print \"Pascal Triangle\"\n",
+ "while q < p:\n",
+ " for r in range(40-3*q, 0, -1):\n",
+ " print \" \",\n",
+ " for x in range(0, q+1):\n",
+ " if x == 0 or q == 0:\n",
+ " binom = 1\n",
+ " else:\n",
+ " binom = (binom*(q-x+1))/x\n",
+ " print \"%6d\" %binom,\n",
+ " print \"\\n\"\n",
+ " q+=1"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input the number of rows: 9\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Pascal Triangle\n",
+ " 1 \n",
+ "\n",
+ " 1 1 \n",
+ "\n",
+ " 1 2 1 \n",
+ "\n",
+ " 1 3 3 1 \n",
+ "\n",
+ " 1 4 6 4 1 \n",
+ "\n",
+ " 1 5 10 10 5 1 \n",
+ "\n",
+ " 1 6 15 20 15 6 1 \n",
+ "\n",
+ " 1 7 21 35 35 21 7 1 \n",
+ "\n",
+ " 1 8 28 56 70 56 28 8 1 \n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.11, page no. 136"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "print \"Enter 1 for triangle(3 sides) & 2 for triangle(base, ht): \",\n",
+ "k = int(raw_input())\n",
+ "if k == 1:\n",
+ " print \"Enter 3 sides - a,b and c\"\n",
+ " a = float(raw_input(\"a: \"))\n",
+ " b = float(raw_input(\"b: \"))\n",
+ " c = float(raw_input(\"c: \"))\n",
+ " p = a + b + c\n",
+ " s = (a + b + c)/2\n",
+ " area = math.sqrt(s*(s-a)*(s-b)*(s-c))\n",
+ " print \"Perimeter = %6.2f\" %p\n",
+ " print \"Area of triangle = %7.2f\" %area\n",
+ "elif k == 2:\n",
+ " print \"Enter height and base\"\n",
+ " height = float(raw_input(\"height: \"))\n",
+ " base = float(raw_input(\"base: \"))\n",
+ " area = (base*height)/2\n",
+ " print \"Area of triangle = %7.2f\" %area"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter 1 for triangle(3 sides) & 2 for triangle(base, ht): "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Enter 3 sides - a,b and c\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "a: 4.55\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "b: 5.00\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "c: 6.00\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Perimeter = 15.55\n",
+ "Area of triangle = 11.11\n"
+ ]
+ }
+ ],
+ "prompt_number": 47
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.12, page no. 137"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import sys\n",
+ "print \"Enter the no of lines in the pyramid: \"\n",
+ "t = int(raw_input())\n",
+ "print \"\\t\\tREVERSED PYRAMID OF DIGITS\"\n",
+ "k = 0\n",
+ "for p in range(t, 0, -1):\n",
+ " k += 1\n",
+ " sys.stdout.write (\" \")\n",
+ " for r in range(0, (k*4)+1):\n",
+ " sys.stdout.write (\" \")\n",
+ " for q in range(p, (2*p)-1): \n",
+ " sys.stdout.write (\"%4d\" %q)\n",
+ " for s in range((2*p)-2, p-1, -1):\n",
+ " sys.stdout.write(\"%4d\\b\" %s)\n",
+ " sys.stdout.write (\"\\n\")\n",
+ "print \" %d\" %p\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the no of lines in the pyramid: \n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "7\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\t\tREVERSED PYRAMID OF DIGITS\n",
+ " 7 8 9 10 11 12 12\b 11\b 10\b 9\b 8\b 7\b\n",
+ " 6 7 8 9 10 10\b 9\b 8\b 7\b 6\b\n",
+ " 5 6 7 8 8\b 7\b 6\b 5\b\n",
+ " 4 5 6 6\b 5\b 4\b\n",
+ " 3 4 4\b 3\b\n",
+ " 2 2\b\n",
+ " \n",
+ " 1\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.13, page no. 137"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "n = 20\n",
+ "x = float(raw_input(\"Input x: \"))\n",
+ "x = x*3.1412/180\n",
+ "t = 1\n",
+ "sum = 1\n",
+ "for i in range(1, n+1):\n",
+ " t = t*pow(-1, (2*i-1))*x*x/(2*i*(2*i-1))\n",
+ " sum += t\n",
+ "print \"COS(X) = %7.3f\" %sum"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input x: 90.00\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "COS(X) = 0.000\n"
+ ]
+ }
+ ],
+ "prompt_number": 62
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.14, page no. 138"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "n = int(raw_input(\"Enter the number of lines: \"))\n",
+ "for p in range(1, n+1):\n",
+ " for i in range(1, n-p):\n",
+ " print \" \",\n",
+ " m = p\n",
+ " for q in range(1, p+1):\n",
+ " print \"%4d\" %m,\n",
+ " m +=1\n",
+ " m = m - 2\n",
+ " for q in range(1, p):\n",
+ " print \"%4d\" %m,\n",
+ " m-=1\n",
+ " print \"\\n\\n\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number of lines: 7\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " 1 \n",
+ "\n",
+ "\n",
+ " 2 3 2 \n",
+ "\n",
+ "\n",
+ " 3 4 5 4 3 \n",
+ "\n",
+ "\n",
+ " 4 5 6 7 6 5 4 \n",
+ "\n",
+ "\n",
+ " 5 6 7 8 9 8 7 6 5 \n",
+ "\n",
+ "\n",
+ " 6 7 8 9 10 11 10 9 8 7 6 \n",
+ "\n",
+ "\n",
+ " 7 8 9 10 11 12 13 12 11 10 9 8 7 \n",
+ "\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 67
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-21 13:22:16 +0000