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-{
- "metadata": {
- "name": "",
- "signature": "sha256:0724a7e756186f06943f5403b91daf5f178ee495f014e11c1fad0330aa0d254c"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "heading",
- "level": 1,
- "metadata": {},
- "source": [
- "Chapter 18 : Pointers and Structures"
- ]
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example: 1, Page No.: 5.130"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Program to print details of person using structure and pointer\n",
- "\n",
- "class account:\n",
- " name=\"\"\n",
- " place=\"\"\n",
- " acctno=0\n",
- " \n",
- "m4=account()\n",
- "m4.name=\"Venkat\"\n",
- "m4.place=\"Arcot\"\n",
- "m4.acctno=24201\n",
- "\n",
- "print \"%s\\t%s\\t%d\\n\"%(m4.name,m4.place,m4.acctno)\n",
- "\n",
- "contents=m4\n",
- "\n",
- "print \"%s\\t%s\\t%d\\n\"%(contents.name,contents.place,contents.acctno)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Venkat\tArcot\t24201\n",
- "\n",
- "Venkat\tArcot\t24201\n",
- "\n"
- ]
- }
- ],
- "prompt_number": 2
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example: 2, Page No.: 5.131"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Program to print name, place, and account number using structure and pointer\n",
- "\n",
- "class account:\n",
- " name=\"\"\n",
- " place=\"\"\n",
- " acctno=0\n",
- " \n",
- "m4=account()\n",
- "m4.name=\"Madhavan\"\n",
- "m4.place=\"Chennai\"\n",
- "m4.acctno=241\n",
- "a=m4\n",
- "\n",
- "print \"%s\\n%s\\n%d\\n\"%(a.name,a.place,a.acctno)\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Madhavan\n",
- "Chennai\n",
- "241\n",
- "\n"
- ]
- }
- ],
- "prompt_number": 7
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example: 3, Page No.: 5.132"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Program to show how the int_pointers structure can be handled.\n",
- "\n",
- "\n",
- "class int_pointers:\n",
- " p1=0\n",
- " p2=0\n",
- " \n",
- "pointers=int_pointers()\n",
- "m1= 80\n",
- "pointers.p1=m1\n",
- "pointers.p2=-40\n",
- "m2=pointers.p2\n",
- "print \"m1= %i, *pointers.p1 = %i\\n\"% (m1,pointers.p1)\n",
- "print \"m2= %i, *pointers.p2 = %i\\n\"% (m2,pointers.p2)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "m1= 80, *pointers.p1 = 80\n",
- "\n",
- "m2= -40, *pointers.p2 = -40\n",
- "\n"
- ]
- }
- ],
- "prompt_number": 15
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Case Study 1: Page No.5.133"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Program to interchange the values stored in two variables using function with pointers. \n",
- "\n",
- "def interchange(a,b):\n",
- " t=a\n",
- " a=b\n",
- " b=t\n",
- " return b,a\n",
- " \n",
- "a=39\n",
- "b=77\n",
- "\n",
- "print \"Before Interchange: a=%d, b=%d\"%(a,b)\n",
- "\n",
- "\n",
- "print \"After Interchange : a=%d, b=%d\"%(interchange(b,a))\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Before Interchange: a=39, b=77\n",
- "After Interchange : a=77, b=39\n"
- ]
- }
- ],
- "prompt_number": 16
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Case Study: 2, Page No.:5.134"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Program to demonstrate the use of structure pointers\n",
- "\n",
- "class book:\n",
- " bno=0\n",
- " bname=''\n",
- " cost=0.0\n",
- "\n",
- "p=[book()for i in range(0,3)]\n",
- "print \"Enter the Book details... \"\n",
- "print \"Enter Book number, Book Name, Book Costs... \"\n",
- "for i in range(0,3):\n",
- " p[i].bno=input()\n",
- " p[i].bname=raw_input()\n",
- " p[i].cost=input()\n",
- " \n",
- "for i in range(0,3):\n",
- " \n",
- " print \"\\n%d\\t%s\\t\\t%d\"%(p[i].bno,p[i].bname,p[i].cost)\n",
- " \n",
- "print \"\\nStructure Output\\n\"\n",
- "ptr=p\n",
- "\n",
- "for i in range(0,3):\n",
- " print \"%d\\t%s\\t\\t%d\"%(ptr[i].bno,ptr[i].bname,ptr[i].cost)\n",
- " \n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter the Book details... \n",
- "Enter Book number, Book Name, Book Costs... \n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "101\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Computer Practice_1\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "240\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "201\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Computer Practice_2\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "250\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "202\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "C++ and JAVA\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "280\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "101\tComputer Practice_1\t240\n",
- "\n",
- "201\tComputer Practice_2\t250\n",
- "\n",
- "202\tC++ and JAVA\t280\n",
- "\n",
- "Structure Output\n",
- "\n",
- "101\tComputer Practice_1\t240\n",
- "201\tComputer Practice_2\t250\n",
- "202\tC++ and JAVA\t280\n"
- ]
- }
- ],
- "prompt_number": 46
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Case Study 3: Page No: 5.136"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Program to count number of vowels,consonants, digits,spaces and other characters in a line of text.\n",
- "\n",
- "vowels='aeiou'\n",
- "consonants='bcdfghjklmnpqrstvwxyz'\n",
- "spaces =' '\n",
- "digits='1234567890'\n",
- "special_characters='!@#$%^&*()_'\n",
- "\n",
- "text=raw_input(\"Enter the text in lower case: \")\n",
- "\n",
- "print \"\\nNumber of vowels: \",dict((v, text.count(v)) for v in text if v in vowels)\n",
- "print \"Number of consonants: \",dict((c, text.count(c)) for c in text if c in consonants)\n",
- "print \"Number of Spaces: \",dict((s, text.count(s)) for s in text if s in spaces)\n",
- "print \"Number of digits: \",dict((d, text.count(d)) for d in text if d in digits)\n",
- "print \"Number of special_characters: \",dict((sc, text.count(sc)) for sc in text if sc in special_characters)\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter the text in lower case: 123 vrb publishers @#$%^&*()\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Number of vowels: {'i': 1, 'e': 1, 'u': 1}\n",
- "Number of consonants: {'b': 2, 'h': 1, 'l': 1, 'p': 1, 's': 2, 'r': 2, 'v': 1}\n",
- "Number of Spaces: {' ': 3}\n",
- "Number of digits: {'1': 1, '3': 1, '2': 1}\n",
- "Number of special_characters: {'@': 1, '#': 1, '%': 1, '$': 1, '&': 1, ')': 1, '(': 1, '*': 1, '^': 1}\n"
- ]
- }
- ],
- "prompt_number": 3
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Case Study 4: Page No.: 5.136"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Program to demonstrate malloc() function\n",
- "\n",
- "NULL=0\n",
- "string = ''\n",
- "if string==NULL:\n",
- " print \"Not Enough memory to allocate buffer\\n\"\n",
- "else:\n",
- " \n",
- " def strcpy(cstring1):\n",
- " import copy\n",
- " cstring2=copy.copy(cstring1)\n",
- " return cstring2 \n",
- "string=\"Hello\"\n",
- "print \"String is %s\" %string"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "String is Hello\n"
- ]
- }
- ],
- "prompt_number": 22
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Case Study 5: Page No.: 5.137"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Program to demonstrate calloc() function\n",
- "\n",
- "string=''\n",
- "\n",
- "def strcpy(cstring1):\n",
- " import copy\n",
- " cstring2=copy.copy(cstring1)\n",
- " return cstring2 \n",
- "stri=\"BHAVANA\"\n",
- "string=strcpy(stri)\n",
- "print \"String is %s\" %string"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "String is BHAVANA\n"
- ]
- }
- ],
- "prompt_number": 20
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Case Study 6: Page No.:5.138"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Program to demonstrate realloc() function\n",
- "#Cannot do in python"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [],
- "prompt_number": 29
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file
generated by cgit (git 2.34.1) at 2025-01-09 09:44:41 +0000