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-{
- "metadata": {
- "name": ""
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "heading",
- "level": 1,
- "metadata": {},
- "source": [
- "Chapter 7: Recursion"
- ]
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.1, Page number: 219"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration, calculation and result\n",
- "str = raw_input('Enter a string: ')\n",
- "\n",
- "print str"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter a string: HELLO\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "HELLO\n"
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.2, Page number: 221"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration, calculation and result\n",
- "str = raw_input('Enter a string: ')\n",
- "\n",
- "print str[::-1]"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter a string: HELLO\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "OLLEH\n"
- ]
- }
- ],
- "prompt_number": 2
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.3, Page number: 224"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def fact (n) :\n",
- " if n>0 :\n",
- " return n * fact (n-1)\n",
- " else :\n",
- " return 1\n",
- "\n",
- "print ('Factorial of %d is %d' % (n, fact (n)))"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 5\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Factorial of 5 is 120\n"
- ]
- }
- ],
- "prompt_number": 3
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.4, Page number: 227"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def printnum (n) :\n",
- " if n>0 :\n",
- " printnum (n-1)\n",
- " print n,\n",
- "\n",
- "print ('Counting up to %d' % n)\n",
- "printnum (n)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 10\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Counting up to 10\n",
- "1 2 3 4 5 6 7 8 9 10\n"
- ]
- }
- ],
- "prompt_number": 4
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5, Page number: 229"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def printeven (n) :\n",
- "\tif not hasattr(printeven, \"x\") : \n",
- "\t\tprinteven.x = 2\n",
- " \n",
- "\tif printeven.x <= n :\n",
- "\t\tprint printeven.x,\n",
- "\t\tprinteven.x = printeven.x + 2\n",
- "\t\tprinteven (n)\n",
- "\n",
- "print ('Even numbers up to %d are' % n)\n",
- "printeven (n)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 10\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Even numbers up to 10 are\n",
- "2 4 6 8 10\n"
- ]
- }
- ],
- "prompt_number": 5
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.6, Page number: 231"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def printodd (x, n) :\n",
- "\tif x <= n : \n",
- "\t\tprint x,\n",
- "\t\tprintodd (x+2, n)\n",
- "\n",
- "print ('Odd numbers up to %d are' % n)\n",
- "printodd (1, n)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 10\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Odd numbers up to 10 are\n",
- "1 3 5 7 9\n"
- ]
- }
- ],
- "prompt_number": 6
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.7, Page number: 232"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def printnum (fro, to) :\n",
- "\tif fro <= to : \n",
- "\t\tprint fro,\n",
- "\t\tprintnum (fro+1, to)\n",
- "\n",
- "print ('Number line for %d is' % n)\n",
- "printnum (-n, n)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 5\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Number line for 5 is\n",
- "-5 -4 -3 -2 -1 0 1 2 3 4 5\n"
- ]
- }
- ],
- "prompt_number": 7
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.8, Page number: 234"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def summate (n) :\n",
- "\tif n > 0 : \n",
- "\t\treturn n + summate (n-1)\n",
- "\telse :\n",
- "\t\treturn 0\n",
- "\n",
- "print ('Sum of first %d natural numbers is %d' % (n, summate (n)))"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 10\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Sum of first 10 natural numbers is 55\n"
- ]
- }
- ],
- "prompt_number": 8
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.9, Page number: 237"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def factors (n) :\n",
- "\tif not hasattr(factors, \"i\") : \n",
- "\t\tfactors.i = 1\n",
- "\t\t\n",
- "\tif factors.i <= n : \n",
- "\t\tif n % factors.i == 0 :\n",
- "\t\t\tprint factors.i,\n",
- "\t\tfactors.i = factors.i + 1\n",
- "\t\tfactors (n)\n",
- "\n",
- "print ('The factors of %d are' % n)\n",
- "factors (n)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 28\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "The factors of 28 are\n",
- "1 2 4 7 14 28\n"
- ]
- }
- ],
- "prompt_number": 9
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.10, Page number: 239"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def multiple (n) :\n",
- "\tif not hasattr(multiple, \"i\") : \n",
- "\t\tmultiple.i = 1\n",
- "\t\t\n",
- "\tif multiple.i <= 10 : \n",
- "\t\tprint ('%d X %d = %d' % (n, multiple.i, n*multiple.i))\n",
- "\t\tmultiple.i = multiple.i + 1\n",
- "\t\tmultiple (n)\n",
- "\n",
- "print ('The first 10 multiples of %d are' % n)\n",
- "multiple (n)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 6\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "The first 10 multiples of 6 are\n",
- "6 X 1 = 6\n",
- "6 X 2 = 12\n",
- "6 X 3 = 18\n",
- "6 X 4 = 24\n",
- "6 X 5 = 30\n",
- "6 X 6 = 36\n",
- "6 X 7 = 42\n",
- "6 X 8 = 48\n",
- "6 X 9 = 54\n",
- "6 X 10 = 60\n"
- ]
- }
- ],
- "prompt_number": 10
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.11, Page number: 241"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def checkprime (n) :\n",
- " flag = 1\n",
- " i = 2\n",
- " while i<n and flag :\n",
- " if n%i == 0 :\n",
- " flag = 0\n",
- " i = i+1\n",
- " return flag\n",
- "\n",
- "result = checkprime (n)\n",
- "\n",
- "if result :\n",
- " print ('The number %d is PRIME ' % n)\n",
- "else :\n",
- " print ('The number %d is COMPOSITE ' % n)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 19\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "The number 19 is PRIME \n"
- ]
- }
- ],
- "prompt_number": 11
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.12, Page number: 243"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def Fibonacci (n) :\n",
- "\tif n < 2 :\n",
- "\t\treturn n\n",
- "\telse :\n",
- "\t\treturn Fibonacci (n-1) + Fibonacci (n-2)\n",
- "\t\n",
- "\n",
- "print ('The %d terms of Fibonacci series are' % n)\n",
- "for i in range (0, n) :\n",
- "\tprint ('%d' % Fibonacci (i)),"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 10\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "The 10 terms of Fibonacci series are\n",
- "0 1 1 2 3 5 8 13 21 34\n"
- ]
- }
- ],
- "prompt_number": 12
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.13, Page number: 244"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "sum = n\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def sumofdigit (n, sum) :\n",
- " while sum>=10 :\n",
- " sum = 0\n",
- " while n>0 :\n",
- " sum = sum + n%10\n",
- " n = n/10\n",
- " n = sum\n",
- " return sum\n",
- "\n",
- "result = sumofdigit (n, sum)\n",
- "\n",
- "print ('Sum of digits of %d is %d' % (n, result))"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 8626\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Sum of digits of 8626 is 4\n"
- ]
- }
- ],
- "prompt_number": 13
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.14, Page number: 245"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def prime (n) :\n",
- " for num in range (3, n+1) :\n",
- " flag = 1\n",
- " for i in range (2, num) :\n",
- " if num % i == 0 : \n",
- " flag = 0\n",
- " if flag :\n",
- " print ('%d ' % num),\n",
- "\n",
- "print ('Prime numbers upto %d are' % n)\n",
- "prime (n)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 30\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Prime numbers upto 30 are\n",
- "3 5 7 11 13 17 19 23 29 \n"
- ]
- }
- ],
- "prompt_number": 15
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.15, Page number: 246"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int (raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def pattern (n) :\n",
- "\tif n > 0 :\n",
- "\t\tpattern (n-1)\n",
- "\t\tfor count in range (1, n+1) :\n",
- "\t\t\tprint ('%d' % count),\n",
- " \tprint\n",
- " \t\n",
- "pattern (n)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 4\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "1\n",
- "1 2\n",
- "1 2 3\n",
- "1 2 3 4\n"
- ]
- }
- ],
- "prompt_number": 16
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.16, Page number: 249"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Variable declaration\n",
- "n = int(raw_input('Enter any number '))\n",
- "\n",
- "# Function declaration, calculation and result\n",
- "def printline (x, total) :\n",
- "\tif x > 0 :\n",
- "\t\tprintline (x-1, total)\n",
- "\t\tfor blk in range (1, total-x+1) :\n",
- "\t\t\tprint ' ',\n",
- "\t\tfor up in range (1, x+1) :\n",
- "\t\t\tprint ('%d' % up),\n",
- "\t\tdown = x-1\n",
- "\t\twhile down>0 :\n",
- "\t\t\tprint ('%d' % down),\n",
- "\t\t\tdown = down-1\n",
- "\t\tprint\n",
- "\n",
- "printline (n, n)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 4\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- " 1\n",
- " 1 2 1\n",
- " 1 2 3 2 1\n",
- "1 2 3 4 3 2 1\n"
- ]
- }
- ],
- "prompt_number": 17
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.17, Page number: 253"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "# Function declaration, calculation and result\n",
- "def listsum () :\n",
- "\tn = int(raw_input('Enter any number '))\n",
- "\tif n > 0 :\n",
- "\t\treturn n + listsum ()\n",
- "\telse :\n",
- "\t\treturn 0\n",
- "\t\t\n",
- "sum = listsum ()\n",
- "print ('Sum of list of numbers is %d' % sum)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 1\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 2\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number 3\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter any number -4\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Sum of list of numbers is 6\n"
- ]
- }
- ],
- "prompt_number": 18
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file