adding book

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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:1198072630a182533bf651767f275df9ee5758e0d781322254bb408a8b4cffaa"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h1>Chapter 15: Virtual Functions and Polymorphism<h1>"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 15.1, Page Number: 358<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "\n",
+      "class B_class:\n",
+      "    def __init__(self):\n",
+      "        self.author=None\n",
+      "    def put_author(self,s):\n",
+      "        self.author=s\n",
+      "    def show_author(self):\n",
+      "        print self.author\n",
+      "        \n",
+      "class D_class(B_class):\n",
+      "    def __init__(self):\n",
+      "        self.title=None\n",
+      "    def put_title(self,num):\n",
+      "        self.title=num\n",
+      "    def show_title(self):\n",
+      "        print \"Title:\",self.title\n",
+      "        \n",
+      "#Variable declaration\n",
+      "p=[B_class()]       #acts as a pointer to B_class type\n",
+      "B_ob=B_class()\n",
+      "\n",
+      "dp=[D_class()]      #acts as a pointer to D_class type\n",
+      "D_ob=D_class()\n",
+      "\n",
+      "p[0]=B_ob           #assigning p to object of base\n",
+      "\n",
+      "\n",
+      "#Access B_class via pointer\n",
+      "p[0].put_author(\"Tom Clancy\")\n",
+      "\n",
+      "#Access D_class via base pointer\n",
+      "p[0]=D_ob\n",
+      "p[0].put_author(\"William Shakespeare\")\n",
+      "\n",
+      "#Show that each author went into proper object\n",
+      "B_ob.show_author()\n",
+      "D_ob.show_author()\n",
+      "print \"\\n\"\n",
+      "\n",
+      "#Since put_title() and show_title() are not part of the base class, \n",
+      "#they are not accessible via the base pointer p and must be accessed \n",
+      "#either directly, or, as shown here, through a pointer to the \n",
+      "#derived type\n",
+      "dp[0]=D_ob\n",
+      "dp[0].put_title(\"The Tempest\")\n",
+      "p[0].show_author()\n",
+      "dp[0].show_title()\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Tom Clancy\n",
+        "William Shakespeare\n",
+        "\n",
+        "\n",
+        "William Shakespeare\n",
+        "Title: The Tempest\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 15.2, Page Number: 361<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "class base:\n",
+      "    def who(self):                #virtual function\n",
+      "        print \"Base\"\n",
+      "\n",
+      "class first_d(base):\n",
+      "    def who(self):                #redifine who() relative to first_d\n",
+      "        print \"First derivation\"\n",
+      "        \n",
+      "class second_d(base):\n",
+      "    def who(self):                #redifine who() relative to second_d\n",
+      "        print \"Second derivation\"\n",
+      " \n",
+      "        \n",
+      "#Variable declaration\n",
+      "base_obj=base()\n",
+      "p=[base()]\n",
+      "first_obj=first_d()\n",
+      "second_obj=second_d()\n",
+      "\n",
+      "p[0]=base_obj\n",
+      "p[0].who()           #access base's who\n",
+      "\n",
+      "p[0]=first_obj\n",
+      "p[0].who()           #access first_d's who\n",
+      "\n",
+      "p[0]=second_obj\n",
+      "p[0].who()           #access second_d's who\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Base\n",
+        "First derivation\n",
+        "Second derivation\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 15.3, Page Number: 363<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "class base:\n",
+      "    def who(self):                #virtual function\n",
+      "        print \"Base\"\n",
+      "\n",
+      "class first_d(base):\n",
+      "    def who(self):                #redifine who() relative to first_d\n",
+      "        print \"First derivation\"\n",
+      "        \n",
+      "class second_d(base):\n",
+      "    #who not defined\n",
+      "    pass\n",
+      " \n",
+      "        \n",
+      "#Variable declaration\n",
+      "base_obj=base()\n",
+      "p=[base()]\n",
+      "first_obj=first_d()\n",
+      "second_obj=second_d()\n",
+      "\n",
+      "p[0]=base_obj\n",
+      "p[0].who()           #access base's who\n",
+      "\n",
+      "p[0]=first_obj\n",
+      "p[0].who()           #access first_d's who\n",
+      "\n",
+      "p[0]=second_obj\n",
+      "p[0].who()           #access base's who because\n",
+      "                     #second_d does not redefine it.\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Base\n",
+        "First derivation\n",
+        "Base\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 15.4, Page Number: 364<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "class base:\n",
+      "    def who(self):                #virtual function\n",
+      "        print \"Base\"\n",
+      "\n",
+      "class first_d(base):\n",
+      "    def who(self):                #redifine who() relative to first_d\n",
+      "        print \"First derivation\"\n",
+      " \n",
+      "#second_d now inherited first_d -- not base\n",
+      "class second_d(first_d):\n",
+      "    #who not defined\n",
+      "    pass\n",
+      " \n",
+      "        \n",
+      "#Variable declaration\n",
+      "base_obj=base()\n",
+      "p=[base()]\n",
+      "first_obj=first_d()\n",
+      "second_obj=second_d()\n",
+      "\n",
+      "p[0]=base_obj\n",
+      "p[0].who()           #access base's who\n",
+      "\n",
+      "p[0]=first_obj\n",
+      "p[0].who()           #access first_d's who\n",
+      "\n",
+      "p[0]=second_obj\n",
+      "p[0].who()           #access first_d's who because\n",
+      "                     #second_d does not redefine it.\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Base\n",
+        "First derivation\n",
+        "First derivation\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 15.5, Page Number: 366<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "class figure:\n",
+      "    def __init__(self):\n",
+      "        self._x=None\n",
+      "        self._y=None\n",
+      "    def set_dim(self,i,j):\n",
+      "        self._x=i\n",
+      "        self._y=j\n",
+      "    def show_area(self):\n",
+      "        print \"No area computation defined\",\n",
+      "        print \"for this class.\"\n",
+      "        \n",
+      "class triangle(figure):\n",
+      "    def show_area(self):\n",
+      "        print \"Triangle with height\",\n",
+      "        print self._x,\"and base\",self._y,\n",
+      "        print \"has an area of\",\n",
+      "        print self._x*0.5*self._y,\".\"\n",
+      "        \n",
+      "class rectangle(figure):\n",
+      "     def show_area(self):\n",
+      "        print \"Rectangle with dimensions\",\n",
+      "        print self._x,\"x\",self._y,\n",
+      "        print \"has an area of\",\n",
+      "        print self._x*self._y,\".\"\n",
+      "        \n",
+      "#Variable declaration\n",
+      "p=[figure()]                #pointer to base type\n",
+      "t=triangle()                #objects of derived type\n",
+      "r=rectangle()\n",
+      "\n",
+      "p[0]=t\n",
+      "p[0].set_dim(10.0,5.0)\n",
+      "p[0].show_area()\n",
+      "\n",
+      "p[0]=r\n",
+      "p[0].set_dim(10.0,5.0)\n",
+      "p[0].show_area()\n",
+      "        "
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Triangle with height 10.0 and base 5.0 has an area of 25.0 .\n",
+        "Rectangle with dimensions 10.0 x 5.0 has an area of 50.0 .\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 15.6, Page Number: 368<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "class figure:\n",
+      "    def __init__(self):\n",
+      "        self._x=None\n",
+      "        self._y=None\n",
+      "    def set_dim(self,i,j=0):\n",
+      "        self._x=i\n",
+      "        self._y=j\n",
+      "    def show_area(self):\n",
+      "        print \"No area computation defined\",\n",
+      "        print \"for this class.\"\n",
+      "        \n",
+      "class triangle(figure):\n",
+      "    def show_area(self):\n",
+      "        print \"Triangle with height\",\n",
+      "        print self._x,\"and base\",self._y,\n",
+      "        print \"has an area of\",\n",
+      "        print self._x*0.5*self._y,\".\"\n",
+      "        \n",
+      "class rectangle(figure):\n",
+      "     def show_area(self):\n",
+      "        print \"Rectangle with dimensions\",\n",
+      "        print self._x,\"x\",self._y,\n",
+      "        print \"has an area of\",\n",
+      "        print self._x*self._y,\".\"\n",
+      "        \n",
+      "class circle(figure):\n",
+      "     def show_area(self):\n",
+      "        print \"Circle with radius\",\n",
+      "        print self._x,\n",
+      "        print \"has an area of\",\n",
+      "        print 3.14*self._x*self._x,\".\"\n",
+      "        \n",
+      "        \n",
+      "#Variable declaration\n",
+      "p=[figure()]                #pointer to base type\n",
+      "t=triangle()                #objects of derived type\n",
+      "r=rectangle()\n",
+      "c=circle()\n",
+      "\n",
+      "p[0]=t\n",
+      "p[0].set_dim(10.0,5.0)\n",
+      "p[0].show_area()\n",
+      "\n",
+      "p[0]=r\n",
+      "p[0].set_dim(10.0,5.0)\n",
+      "p[0].show_area()\n",
+      "\n",
+      "p[0]=c\n",
+      "p[0].set_dim(9.0)\n",
+      "p[0].show_area()\n",
+      "        "
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Triangle with height 10.0 and base 5.0 has an area of 25.0 .\n",
+        "Rectangle with dimensions 10.0 x 5.0 has an area of 50.0 .\n",
+        "Circle with radius 9.0 has an area of 254.34 .\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file