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Diffstat (limited to 'C++_from_the_Ground/Chapter_11(1).ipynb')
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diff --git a/C++_from_the_Ground/Chapter_11(1).ipynb b/C++_from_the_Ground/Chapter_11(1).ipynb new file mode 100644 index 00000000..b59e52c7 --- /dev/null +++ b/C++_from_the_Ground/Chapter_11(1).ipynb @@ -0,0 +1,347 @@ +{ + "metadata": { + "name": "Chapter 11" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h1>Chapter 11: Introducing the Class<h1>" + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.1, Page Number: 249<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Illustration of a class in python'''\n\n#This creates the class queue\nclass queue:\n #Initialize the queue \n def __init__(self):\n self.__sloc=0\n self.__rloc=-1\n self.__q=[]\n \n #Put an integer into the queue\n def qput(self,i):\n if self.__sloc==100:\n print \"Queue is full.\"\n return\n self.__sloc+=1\n self.__q.append(i)\n \n #Get an integer from the queue\n def qget(self):\n if self.__rloc==self.__sloc:\n print \"Queue underflow\"\n return\n self.__rloc+=1\n return self.__q[self.__rloc] \n \n\n \n#Create two queue objects\nb=queue()\na=queue()\n\na.qput(10)\nb.qput(19)\n\na.qput(20)\nb.qput(1)\n\n#Result\nprint \"Contents of queue a: \",\nprint a.qget(),' ',a.qget()\n\nprint \"Contents of queue b: \",\nprint b.qget(),' ',b.qget()\n\n\n \n", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "Contents of queue a: 10 20\nContents of queue b: 19 1\n" + } + ], + "prompt_number": 3 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.2, Page Number: 250<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Demonstrate class member access'''\n \nclass myclass:\n def __init__(self):\n self.__a=None #private member\n self.b=None #public member\n #public functions\n def setlab(self,i):\n self.__a=i #refer to a\n self.b=i*i #refer to b\n return\n def geta(self):\n return self.__a #refer to a\n def reset(self):\n #call setlab using self\n self.setlab(0) #the object is already known\n \n \nob=myclass()\nob.setlab(5) #set ob.a and ob.b\nprint \"ob after setlab(5): \",ob.geta(),' ',\nprint ob.b #can access b because it is public\n\nob.b=20 #can access b because it is public\nprint \"ob after ob.b=20: \",\nprint ob.geta(),' ',ob.b\n\nob.reset()\nprint \"ob after ob.reset(): \",ob.geta(),' ',ob.b\n\n", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "ob after setlab(5): 5 25\nob after ob.b=20: 5 20\nob after ob.reset(): 0 0\n" + } + ], + "prompt_number": 4 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.3, Page Number: 254<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Demonstrate a constructor and a destructor'''\n#The destructors of python behave a little differently.\n\n#This creates the class queue\nclass queue:\n \n #Constructor\n def __init__(self): \n self.__q=[]\n self.__rloc=-1\n self.__sloc=0\n print \"Queue initialized\"\n \n #Destructor\n def __del__(self):\n print (\"Queue destroyed\")\n \n #Put an integer into the queue\n def qput(self,i):\n if self.__sloc == 100:\n print \"Queue is full\"\n return \n self.__sloc+=1\n self.__q.append(i)\n \n #Get an integer from the queue\n def qget(self):\n if self.__rloc==self.__sloc:\n print \"Queue underflow\"\n return\n self.__rloc+=1\n return self.__q[self.__rloc]\n \n#Create two queue objects\na=queue()\n\n\na.qput(10)\na.qput(20)\nb=queue()\nb.qput(19)\n\nb.qput(1)\n\n#Result\nprint a.qget(),' ',\nprint a.qget(),' ',\nprint b.qget(),' ',\nprint b.qget(),' '\n", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "Queue initialized\nQueue destroyed\nQueue initialized\nQueue destroyed\n10 20 19 1 \n" + } + ], + "prompt_number": 2 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.4, Page Number: 257<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Parameterized Constructors'''\n\n#This creates the class queue\nclass queue: \n \n #Constructor\n def __init__(self,i): \n self.__q=[]\n self.__rloc=-1\n self.__sloc=0\n self.__who=i\n print \"Queue \",self.__who,\" initialized.\"\n \n #Destructor\n def __del__():\n print \"Queue \",self.__who,\" destroyed\"\n \n #Put an integer into the queue\n def qput(self,i):\n if self.__sloc == 100:\n print \"Queue is full\"\n return \n self.__sloc+=1\n self.__q.append(i)\n \n #Get an integer from the queue\n def qget(self):\n if self.__rloc==self.__sloc:\n print \"Queue underflow\"\n return\n self.__rloc+=1\n return self.__q[self.__rloc]\n \na=queue(1)\nb=queue(2)\n\na.qput(10)\nb.qput(19)\n\na.qput(20)\nb.qput(1)\n\n#Result\nprint a.qget(),' ',\nprint a.qget(),' ',\nprint b.qget(),' ',\nprint b.qget(),' '\n", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "Queue 1 initialized.\nQueue destroyed\nQueue 2 initialized.\nQueue destroyed\n10 20 19 1 \n" + } + ], + "prompt_number": 3 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.5, Page Number: 258<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Passing more than a single arguments'''\nclass widget:\n \n #Pass two arguments to the constructor\n def __init__(self,a,b):\n self.__i=a\n self.__j=b\n \n def put_widget(self):\n print self.__i,\" \",self.__j\n\n#Initializing\nx=widget(10,20)\ny=widget(0,0)\n\nx.put_widget()\ny.put_widget()\n\n ", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "10 20\n0 0\n" + } + ], + "prompt_number": 5 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.6, Page Number: 259<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''An example of class'''\n\nclass myclass:\n \n #Constructor\n def __init__(self,x):\n self.a=x\n #To get the vale of a\n def get_a(self):\n return self.a\n\n#Initializing\nob=myclass(4)\n\n#Result\nprint ob.get_a()", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "4\n" + } + ], + "prompt_number": 1 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.7, Page Number: 260<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Using structures to create a class'''\n\nfrom ctypes import *\n\nclass c1(Structure):\n _fields_=[(\"__i\", c_int)] #private member\n def get_i(self): #public finctions\n return self.__i\n def put_i(self,j):\n self.__i=j\n\n#Variable declaration\ns=c1()\n\ns.put_i(10)\n\n#Result\nprint s.get_i()\n \n ", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "10\n" + } + ], + "prompt_number": 1 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.8, Page Number: 261<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Now we use class instead'''\n\nclass c1:\n def __init__(self):\n self.__i=None #private member\n def get_i(self): #public finctions\n return self.__i\n def put_i(self,j):\n self.__i=j\n\n#Variable declaration\ns=c1()\n\ns.put_i(10)\n\n#Result\nprint s.get_i()\n \n ", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "10\n" + } + ], + "prompt_number": 2 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.9, Page Number: 263<h3> " + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Create a union-based class'''\n\nfrom ctypes import *\n\n#Creates a union\nclass u_type(Union):\n _fields_ = [(\"i\",c_short),\n (\"ch\", c_char*2)]\n #Constructor\n def __init__(self,a):\n self.i=a\n \n #Show the characters that comprise a short int.\n def showchars(self):\n print self.ch[0]\n print self.ch[1]\n \n \nu=u_type(1000)\n\n#Displays char of 1000\nu.showchars()", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "\ufffd\n\u0003\n" + } + ], + "prompt_number": 2 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.10, Page Number: 264<h3> " + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''A simple class program'''\n#There is no inline function in python\n\nclass c1:\n def __init__(self):\n self.__i=None\n def get_i(self):\n return self.i\n def put_i(self,j):\n self.i=j\n\n#Variable declaration\ns=c1()\n\ns.put_i(10)\n\n#Result\nprint s.get_i()", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "10\n" + } + ], + "prompt_number": 2 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.11, Page Number: 265<h3> " + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''A simple class program'''\n#There is no inline functions in python\n\nclass c1:\n def __init__(self):\n self.__i=None\n def get_i(self):\n return self.i\n def put_i(self,j):\n self.i=j\n\n#Variable declaration\ns=c1()\n\ns.put_i(10)\n\n#Result\nprint s.get_i()", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "10\n" + } + ], + "prompt_number": 3 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.12, Page Number: 267<h3> " + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''An example of arrays of objects'''\n\nclass display:\n def __init__(self):\n width=None\n height=None\n res=None\n def set_dim(self,w,h):\n self.width=w\n self.height=h\n def get_dim(self):\n return self.width,self.height\n def set_res(self,r):\n self.res=r\n def get_res(self):\n return self.res\n \n#Variable decleration\nnames=[\"low\",\"medium\",\"high\"] \n(low,medium,high)=(0,1,2) #For enumeration type\nw=None\nh=None\ndisplay_mode=[]*3\n\nfor i in range(3):\n display_mode.append(display())\n\n#Initialize the array of objects using member functions\ndisplay_mode[0].set_res(low)\ndisplay_mode[0].set_dim(640,480)\n\ndisplay_mode[1].set_res(medium)\ndisplay_mode[1].set_dim(800,600)\n\ndisplay_mode[2].set_res(high)\ndisplay_mode[2].set_dim(1600,1200)\n\n#Result\nprint \"Available display modes: \"\nfor i in range(3):\n print names[display_mode[i].get_res()],\" : \",\n w,h=display_mode[i].get_dim()\n print w,\" by \",h", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "Available display modes: \nlow : 640 by 480\nmedium : 800 by 600\nhigh : 1600 by 1200\n" + } + ], + "prompt_number": 3 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.13, Page Number: 268<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Initialize an array of objects'''\n\nclass samp:\n __a=None\n def __init__(self,n):\n self.__a=n\n def get_a(self):\n return self.__a\n\n#Initializing the list\nsampArray=[samp(-1),samp(-2),samp(-3),samp(-4)]\n\n#Display\nfor i in range(4):\n print sampArray[i].get_a(),' ',", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "-1 -2 -3 -4 \n" + } + ], + "prompt_number": 4 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.14, Page Number: 269<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Two dimensional array if objects'''\n\nclass samp:\n __a=None\n __b=None\n def __init__(self,n,m):\n self.__a=n\n self.__b=m\n def get_a(self):\n return self.__a\n def get_b(self):\n return self.__b\n \n#Initializing the list\nsampArray=[[samp(1,2),samp(3,4)],\n [samp(5,6),samp(7,8)],\n [samp(9,10),samp(11,12)],\n [samp(13,14),samp(15,16)]]\n\n#Display\nfor i in range(4):\n print sampArray[i][0].get_a(),' ',\n print sampArray[i][0].get_b()\n print sampArray[i][1].get_a(),' ',\n print sampArray[i][1].get_b()", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "1 2\n3 4\n5 6\n7 8\n9 10\n11 12\n13 14\n15 16\n" + } + ], + "prompt_number": 5 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.15, Page Number: 270<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''A simple example using an object pointer'''\n\nfrom ctypes import *\n\nclass P_example(Structure):\n __num=None\n def set_num(self,val):\n self.__num=val\n def show_num(self):\n print self.__num\n\n#Variable declaration\nob=P_example() #Declare an object to the structure\np=POINTER(P_example) #Declare a pointer to the structure\n\nob.set_num(1) #access ob directly\nob.show_num()\n\np=ob #assign p the address of ob\np.show_num() #access ob using pointer\n \n ", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "1\n1\n" + } + ], + "prompt_number": 6 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": "<h3>Example 11.16, Page Number: 271<h3>" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "'''Pointer to array of objects'''\n\nclass P_example(Structure):\n __num=None\n def set_num(self,val):\n self.__num=val\n def show_num(self):\n print self.__num\n \n#Variable declaration\nob=[P_example(),P_example()] #Declare an object to the structure\np=POINTER(P_example) #Declare a pointer to the structure\n\nob[0].set_num(10) #access objects directly\nob[1].set_num(20)\n\np=ob #obtain pointer to first element\np[0].show_num() #access ob using pointer\n\np[1].show_num()\n\np[0].show_num()\n", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "10\n20\n10\n" + } + ], + "prompt_number": 7 + }, + { + "cell_type": "code", + "collapsed": false, + "input": "", + "language": "python", + "metadata": {}, + "outputs": [] + } + ], + "metadata": {} + } + ] +}
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