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Program to illustrate an example of Polymorphism ( Pure Virtual functions ).

Posted By: Easy Tutor     Category: C++ Programming     Views: 4504

A C++ Program to illustrate an example of Polymorphism ( Pure Virtual functions ).

Code for Program to illustrate an example of Polymorphism ( Pure Virtual functions ). in C++ Programming

 #include<iostream.h>
 #include<graphics.h>
 #include<stdlib.h>
 #include<conio.h>


 /*************************************************************************///------------------------------  shape  --------------------------------///*************************************************************************/class shape
    {
       public:
        virtualvoid draw()=0;
    };

 /*************************************************************************///--------------------------  draw_rectangle  ---------------------------///*************************************************************************/class draw_rectangle:public shape
    {
       public:
        void draw()  { rectangle(225,225,180,180);  }
    };

 /*************************************************************************///---------------------------  draw_arc  --------------------------------///*************************************************************************/class draw_arc:public shape
    {
       public:
        void draw()  { arc(200,200,45,135,100);  }
    };

 /*************************************************************************///---------------------------  draw_circle  -----------------------------///*************************************************************************/class draw_circle:public shape
    {
       public:
        void draw()  { circle(200,200,60);  }
    };


 main()
    {
       int driver=VGA;
       int mode=VGAHI;
       int error_code;

       initgraph(&driver,&mode,"..\\Bgi");

       error_code=graphresult( );

       if(error_code!=grOk)
          {
             restorecrtmode( );
             textmode(BW80);
             clrscr( );

             cout<<" \n Fatal Error  : Graphic Driver not initialized"<<endl;
             cout<<" Error Reason : "<<grapherrormsg(error_code)<<endl;
             cout<<" \n Press any key to exit...";

             getch( );
             exit(1);
          }

       shape *ptr;
       draw_rectangle r;
       draw_arc a;
       draw_circle c;

       ptr=&r;
       ptr->draw();

       ptr=&a;
       ptr->draw();

       ptr=&c;
       ptr->draw();

       getch();
       closegraph();
       return 0;
    }
  
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Easy Tutor
Easy Tutor author of Program to illustrate an example of Polymorphism ( Pure Virtual functions ). is from United States. Easy Tutor says

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