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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:c565a0de8f316cbc19d18a7bdba735b6241f6d0c0c10c2d49245aa88403df9e7"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 6, The While and do...While Loops"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 6-1 , Page number: 86"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# A first look at the while loop\n",
+ "\n",
+ "i = 1\n",
+ "\n",
+ "while i < 11:\n",
+ "\tprint \"This is line number %d\"%i\n",
+ "\ti += 1 \t\t\t# Python doesn't support \"++\" or \"--\" shorthand expressions"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "This is line number 1\n",
+ "This is line number 2\n",
+ "This is line number 3\n",
+ "This is line number 4\n",
+ "This is line number 5\n",
+ "This is line number 6\n",
+ "This is line number 7\n",
+ "This is line number 8\n",
+ "This is line number 9\n",
+ "This is line number 10\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 6-2 , Page number: 89"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# Countdown to blastoff\n",
+ "\n",
+ "i = 10\n",
+ "\n",
+ "print \"Countdown\"\n",
+ "\n",
+ "while i >= 0 :\n",
+ "\tprint \"%d\"%i\n",
+ "\ti -= 1\n",
+ "\n",
+ "print \"\\n\\nBlastoff!\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Countdown\n",
+ "10\n",
+ "9\n",
+ "8\n",
+ "7\n",
+ "6\n",
+ "5\n",
+ "4\n",
+ "3\n",
+ "2\n",
+ "1\n",
+ "0\n",
+ "\n",
+ "\n",
+ "Blastoff!\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 6-3 , Page number: 90"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# Hailstones\n",
+ "\n",
+ "counter = 0;\n",
+ "\n",
+ "print \"Enter a positive integer:\",\n",
+ "n = 51\n",
+ "print n\n",
+ "\n",
+ "nsave = n\n",
+ "\n",
+ "\n",
+ "while n > 1:\n",
+ "\tif n % 2 :\t\t\t# if (n % 2) is non-zero, n is not divisible by 2 and is therefore odd\n",
+ "\t\tn = n * 3 + 1\n",
+ "\telse :\n",
+ "\t\tn /= 2\n",
+ "\tcounter += 1\n",
+ "\tprint \"Step %4d: n = %4d\"%(counter,n)\n",
+ "\n",
+ "print \"\\n\\n%d went to 1 in %d steps.\"%(nsave,counter)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter a positive integer: 51\n",
+ "Step 1: n = 154\n",
+ "Step 2: n = 77\n",
+ "Step 3: n = 232\n",
+ "Step 4: n = 116\n",
+ "Step 5: n = 58\n",
+ "Step 6: n = 29\n",
+ "Step 7: n = 88\n",
+ "Step 8: n = 44\n",
+ "Step 9: n = 22\n",
+ "Step 10: n = 11\n",
+ "Step 11: n = 34\n",
+ "Step 12: n = 17\n",
+ "Step 13: n = 52\n",
+ "Step 14: n = 26\n",
+ "Step 15: n = 13\n",
+ "Step 16: n = 40\n",
+ "Step 17: n = 20\n",
+ "Step 18: n = 10\n",
+ "Step 19: n = 5\n",
+ "Step 20: n = 16\n",
+ "Step 21: n = 8\n",
+ "Step 22: n = 4\n",
+ "Step 23: n = 2\n",
+ "Step 24: n = 1\n",
+ "\n",
+ "\n",
+ "51 went to 1 in 24 steps.\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 6-4 , Page number: 92"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# Computing the factorial\n",
+ "\n",
+ "print \"Type in a positive integer:\",\n",
+ "n = 6\n",
+ "print n\n",
+ "\n",
+ "nsave = n\n",
+ "factorial = 1\n",
+ "\n",
+ "while n > 1 :\t\n",
+ "\tfactorial *= n\n",
+ "\tn -= 1\n",
+ "\n",
+ "print \"Factorial of %d = %d\"%(nsave,factorial)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Type in a positive integer: 6\n",
+ "Factorial of 6 = 720\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 6-5 , Page number: 93"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# Computing the factorial (shorter version)\n",
+ "\n",
+ "print \"Type in a positive integer: \",\n",
+ "n = 6\n",
+ "print n\n",
+ "\n",
+ "nsave = n\n",
+ "factorial = 1\n",
+ "\n",
+ "while n > 1 :\n",
+ "\tfactorial *= n # Since python doesn't support '--' expression, the given program cannot be shortened\n",
+ "\tn -= 1\n",
+ "\n",
+ "print \"Factorial of %d = %d\"%(nsave,factorial)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Type in a positive integer: 6\n",
+ "Factorial of 6 = 720\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 6-6 , Page number: 95"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# Illustration of do..while loops\n",
+ "\n",
+ "# This program reads in an integer, adds up the values of each of its individual digits, and prints out the sum.\n",
+ "\n",
+ "sum = 0\n",
+ "\n",
+ "print \"Type in an integer:\",\n",
+ "n = 1776\n",
+ "print n\n",
+ "\n",
+ "# There is no do...while loop in python\n",
+ "# An equivalent while loop can work\n",
+ "\n",
+ "while n > 0 :\n",
+ "\trightmost_digit = n % 10\t# Extract rightmost digit\n",
+ "\tsum += rightmost_digit\n",
+ "\tn /= 10\t\t\t\t\t\t# Move next digit into rightmost position\n",
+ "\n",
+ "print \"The sum of the digits is %d\"%sum\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Type in an integer: 1776\n",
+ "The sum of the digits is 21\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 6-7 , Page number: 97"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import sys\n",
+ "\n",
+ "# This program reads in an integer and prints it out backwards\n",
+ "\n",
+ "print \"Type in an integer: \",\n",
+ "n = 5746\n",
+ "print n\n",
+ "\n",
+ "print \"%d backwards is \"%n,\n",
+ "\n",
+ "while n > 0 :\n",
+ "\trightmost_digit = n % 10\n",
+ "\tsys.stdout.write(\"%d\"%rightmost_digit) # For printing in the same line without implicit whitespaces\n",
+ "\tn /= 10\n",
+ "print \t\t\t# For the new line\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Type in an integer: 5746\n",
+ "5746 backwards is 6475\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 6-8 , Page number: 99"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# A program to read in numbers and print out their squares\n",
+ "\n",
+ "print \"Enter an integer (negative to quit):\",\n",
+ "n = 5\n",
+ "print n\n",
+ "\n",
+ "while n > 0 :\n",
+ "\tprint \"%d squared is %d\"%(n,n*n)\n",
+ "\tprint \"\\nEnter an integer (negative to quit):\",\n",
+ "\tn = -1\n",
+ "\tprint n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter an integer (negative to quit): 5\n",
+ "5 squared is 25\n",
+ "\n",
+ "Enter an integer (negative to quit): -1\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 6-9 , Page number: 100"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# A program to read in radius values and print out the circumference and area\n",
+ "\n",
+ "pi = 3.1416\n",
+ "\n",
+ "print \"Enter radius (negative to quit):\",\n",
+ "radius = 4.5\n",
+ "print radius\n",
+ "\n",
+ "while radius >= 0.0 :\n",
+ "\tprint \"The circumference is %f\"%(2.0 * pi * radius)\n",
+ "\tprint \"The area is %f\"%(pi * radius * radius)\n",
+ "\tprint \"\\nEnter radius (negative to quit):\",\n",
+ "\tradius = -1.0\n",
+ "\tprint radius\n",
+ "\t\n",
+ "\t"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter radius (negative to quit): 4.5\n",
+ "The circumference is 28.274400\n",
+ "The area is 63.617400\n",
+ "\n",
+ "Enter radius (negative to quit): -1.0\n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 6-10 , Page number: 101"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "# A program to read in length and width and print out the perimeter and area\n",
+ "\n",
+ "print \"Enter length and width\"\n",
+ "print \" (one or both negative to quit):\",\n",
+ "length = 4\n",
+ "width = 5\n",
+ "print length,width\n",
+ "\n",
+ "while length > 0 and width > 0 : \n",
+ "\tprint \"The perimeter is %d\"%(2*(length+width))\n",
+ "\tprint \"The area is %d\"%(length*width)\n",
+ "\tprint \"\\nEnter length and width\"\n",
+ "\tprint \" (one or both negative to quit):\",\n",
+ "\tlength = -1\n",
+ "\twidth = 0\n",
+ "\tprint length,width\t"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter length and width\n",
+ " (one or both negative to quit): 4 5\n",
+ "The perimeter is 18\n",
+ "The area is 20\n",
+ "\n",
+ "Enter length and width\n",
+ " (one or both negative to quit): -1 0\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-20 16:19:02 +0000