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-{
- "metadata": {
- "name": "",
- "signature": "sha256:73c04e2c14bfab695e4acf07dc7752334b6372d624570a4e051fd91aeeb761f7"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h1>Chapter 10: Structures and Unions<h1>"
- ]
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 10.1, Page Number: 223<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "class inv_type:\n",
- " def __init__(self):\n",
- " self.item=None\n",
- " self.cost=0\n",
- " self.retail=0\n",
- " self.on_hand=0\n",
- " self.lead_time=0\n",
- "\n",
- "#Variable declaration\n",
- "size=100 \n",
- "invtry = []*size\n",
- "i=5 #User iput for menu selection\n",
- "\n",
- "#Initialize the array\n",
- "def init_list():\n",
- " for t in range(size):\n",
- " invtry.append(inv_type())\n",
- " \n",
- "#get a menu selection\n",
- "def menu():\n",
- " global i\n",
- " print \"(E)nter\"\n",
- " print \"(D)isplay\"\n",
- " print \"(U)pdate\"\n",
- " print \"(Q)uit\"\n",
- " print \"choose one: \"\n",
- " i-=1\n",
- " return i\n",
- "\n",
- "#enter items into the list\n",
- "def enter():\n",
- " #find the first free structure\n",
- " for i in range(size):\n",
- " if not(invtry[i].item==None):\n",
- " break\n",
- " #i will be size if list is full\n",
- " if i==size:\n",
- " print \"List full.\"\n",
- " return\n",
- " input(i)\n",
- " \n",
- "#Input the information\n",
- "def input(i):\n",
- " #Enter information; User input\n",
- " invtry[i].item=\"Gloves\"\n",
- " invtry[i].cost=10\n",
- " invtry[i].retail=25\n",
- " invtry[i].on_hand=50\n",
- " invtry[i].lead_time=10\n",
- " \n",
- "#Modify an existing item\n",
- "def update():\n",
- " name=\"Gloves\" #User input\n",
- " for i in range(size):\n",
- " if not(name==invtry[i].item):\n",
- " break\n",
- " if i==size:\n",
- " print \"Item not found.\"\n",
- " return\n",
- " print \"Enter new information.\"\n",
- " input(i)\n",
- " \n",
- "#Display the list\n",
- "def display():\n",
- " for t in range(size):\n",
- " if not(invtry[t].item==None):\n",
- " print invtry[t].item\n",
- " print \"Cost: $\",invtry[t].cost\n",
- " print \"Retail: $\",invtry[t].retail\n",
- " print \"On hand: \",invtry[t].on_hand\n",
- " print \"Resupply time: \",invtry[t].lead_time,\" days\"\n",
- " \n",
- "\n",
- "init_list()\n",
- "while True:\n",
- " choice=menu()\n",
- " if choice==4:\n",
- " enter()\n",
- " elif choice==3:\n",
- " display()\n",
- " elif choice==2:\n",
- " update()\n",
- " elif choice==1:\n",
- " break"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "(E)nter\n",
- "(D)isplay\n",
- "(U)pdate\n",
- "(Q)uit\n",
- "choose one: \n",
- "(E)nter\n",
- "(D)isplay\n",
- "(U)pdate\n",
- "(Q)uit\n",
- "choose one: \n",
- "Gloves\n",
- "Cost: $ 10\n",
- "Retail: $ 25\n",
- "On hand: 50\n",
- "Resupply time: 10 days\n",
- "(E)nter\n",
- "(D)isplay\n",
- "(U)pdate\n",
- "(Q)uit\n",
- "choose one: \n",
- "Enter new information.\n",
- "(E)nter\n",
- "(D)isplay\n",
- "(U)pdate\n",
- "(Q)uit\n",
- "choose one: \n"
- ]
- }
- ],
- "prompt_number": 11
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 10.2, Page Number: 226<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "class sample:\n",
- " a=None\n",
- " ch=None\n",
- " \n",
- "def f1(parm):\n",
- " print parm.a,\" \",parm.ch\n",
- "\n",
- "#declare arg\n",
- "arg=sample() \n",
- "\n",
- "#initialize arg\n",
- "arg.a=1000\n",
- "arg.ch='X'\n",
- "\n",
- "#call function\n",
- "f1(arg)\n",
- " "
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1000 X\n"
- ]
- }
- ],
- "prompt_number": 12
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 10.3, Page Number: 227<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "class stype:\n",
- " a=None\n",
- " b=None\n",
- "\n",
- "#Variable declaration\n",
- "svar1=stype()\n",
- "svar2=stype()\n",
- "\n",
- "svar1.a=svar1.b=10\n",
- "svar2.a=svar2.b=20\n",
- "\n",
- "print \"Structures before assignment.\"\n",
- "print \"svar1: \",svar1.a,' ',svar1.b\n",
- "print \"svar1: \",svar2.a,' ',svar2.b\n",
- "\n",
- "svar2=svar1 #assign structures\n",
- "\n",
- "#Result\n",
- "print \"\\nStructures before assignment.\"\n",
- "print \"svar1: \",svar1.a,' ',svar1.b\n",
- "print \"svar1: \",svar2.a,' ',svar2.b"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Structures before assignment.\n",
- "svar1: 10 10\n",
- "svar1: 20 20\n",
- "\n",
- "Structures before assignment.\n",
- "svar1: 10 10\n",
- "svar1: 10 10\n"
- ]
- }
- ],
- "prompt_number": 13
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 10.4, Page Number: 230<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "import datetime\n",
- "\n",
- "date=datetime.datetime.now()\n",
- "\n",
- "#Result\n",
- "print date.time()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "17:06:28.236000\n"
- ]
- }
- ],
- "prompt_number": 14
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 10.5, Page Number: 231<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "import datetime\n",
- "\n",
- "date=datetime.datetime.now()\n",
- "\n",
- "#Result\n",
- "print date.ctime()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Sat Sep 14 17:07:14 2013\n"
- ]
- }
- ],
- "prompt_number": 15
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 10.6, Page Number: 232<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "class mystruct:\n",
- " a=None\n",
- " b=None\n",
- "\n",
- "def f(var):\n",
- " var[0].a=var[0].a*var[0].a\n",
- " var[0].b=var[0].b/var[0].b\n",
- " return var[0]\n",
- " \n",
- "#Variable declaration\n",
- "x=[]\n",
- "x.append(mystruct())\n",
- "y=mystruct()\n",
- "\n",
- "#Initializing\n",
- "x[0].a=10\n",
- "x[0].b=20\n",
- "\n",
- "print \"Original x.a and x.b: \",x[0].a,' ',x[0].b\n",
- "\n",
- "y=f(x) #function call\n",
- "\n",
- "#Result\n",
- "print \"Modified x.a and x.b: \",x[0].a,' ',x[0].b\n",
- "print \"Modified y.a and y.b: \",y.a,' ',y.b\n",
- "\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Original x.a and x.b: 10 20\n",
- "Modified x.a and x.b: 100 1\n",
- "Modified y.a and y.b: 100 1\n"
- ]
- }
- ],
- "prompt_number": 16
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 10.7, Page Number: 239<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "class swap_bytes:\n",
- " ch=[0,0]\n",
- "\n",
- "#Exchange of bytes\n",
- "def disp_binary(u):\n",
- " t=128\n",
- " while not(t==0):\n",
- " if u&t:\n",
- " print \"1 \",\n",
- " else:\n",
- " print \"0 \",\n",
- " t=t/2\n",
- "\n",
- "#Variable declaration\n",
- "sb=swap_bytes()\n",
- "\n",
- "sb.ch[0]=15\n",
- "\n",
- "print \"Original bytes: \",\n",
- "disp_binary(sb.ch[1])\n",
- "disp_binary(sb.ch[0])\n",
- "\n",
- "#Exchange bytes\n",
- "temp=sb.ch[0]\n",
- "sb.ch[0]=sb.ch[1]\n",
- "sb.ch[1]=temp\n",
- "\n",
- "#Result\n",
- "print \"\\nExchanged bytes: \",\n",
- "disp_binary(sb.ch[1])\n",
- "disp_binary(sb.ch[0])\n",
- "\n",
- "\n",
- " "
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Original bytes: 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 \n",
- "Exchanged bytes: 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 \n"
- ]
- }
- ],
- "prompt_number": 17
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 10.8, Page Number: 240<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "ch='a'\n",
- "\n",
- "while True:\n",
- " print \"\\n\",ch,\n",
- " print bin(ord(ch)) #Display the bit pattern for each character\n",
- " ch=chr(ord(ch)+1)\n",
- " if ch=='r':\n",
- " break"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "a 0b1100001\n",
- "\n",
- "b 0b1100010\n",
- "\n",
- "c 0b1100011\n",
- "\n",
- "d 0b1100100\n",
- "\n",
- "e 0b1100101\n",
- "\n",
- "f 0b1100110\n",
- "\n",
- "g 0b1100111\n",
- "\n",
- "h 0b1101000\n",
- "\n",
- "i 0b1101001\n",
- "\n",
- "j 0b1101010\n",
- "\n",
- "k 0b1101011\n",
- "\n",
- "l 0b1101100\n",
- "\n",
- "m 0b1101101\n",
- "\n",
- "n 0b1101110\n",
- "\n",
- "o 0b1101111\n",
- "\n",
- "p 0b1110000\n",
- "\n",
- "q 0b1110001\n"
- ]
- }
- ],
- "prompt_number": 18
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 10.9, Page Number: 242<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "#Variable declaration\n",
- "ch=['X','Y']\n",
- "c=\"\"\n",
- "def disp_bits(u):\n",
- " t=128\n",
- " global c\n",
- " while not(t==0):\n",
- " if u&t:\n",
- " c=c+\"1\"\n",
- " else:\n",
- " c=c+\"0\"\n",
- " t=t/2 \n",
- " return c\n",
- "\n",
- "#Result\n",
- "print \"union as chars: \",ch[0],ch[1]\n",
- "print \"union as integer: \",\n",
- "c= disp_bits(ord(ch[1]))\n",
- "c= disp_bits(ord(ch[0]))\n",
- "print int(str(c),2)\n",
- "\n",
- "\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "union as chars: X Y\n",
- "union as integer: 22872\n"
- ]
- }
- ],
- "prompt_number": 19
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [],
- "language": "python",
- "metadata": {},
- "outputs": []
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-19 18:23:42 +0000