C program to display a rectangle, circle and triangle, C/C++ Programming

Aim: To implement a program to display a rectangle, circle and triangle.

Code:                      

class shape

{

            public:

                        virtual void dim()=0;

                        virtual void draw()=0;

};

class rect:public shape

{

            int top,bottom,left,right;

            public:

                        void dim()

                        {

                                    cout<<"Enter the dimensions of the rectangle\n";

                                    cout<<"Enter the left and top co-ordinate\n";

                                    cin>>left>>top;

                                    cout<<"Enter the right and bottom co-ordinate\n";

                                    cin>>right>>bottom;

                        }

                        void draw()

                        {

                                    rectangle(left,top,right,bottom);

                        }

};

class triangle:public shape

{

            int x1,x2,x3,y1,y2,y3;

            public:

                        void dim()

                        {

                                    cout<<"Enter the co-ordinates of the triangle\n";

                                    cout<<"Enter first co-ordinate\n";

                                    cin>>x1>>y1;

                                    cout<<"Enter second co-ordinate\n";

                                    cin>>x2>>y2;

                                    cout<<"Enter third co-ordinate\n";

                                    cin>>x3>>y3;

                        }

                        void draw()

                        {

                                    line(x1,y1,x2,y2);

                                    line(x2,y2,x3,y3);

                                    line(x3,y3,x1,y1);

                        }

};

class circ:public shape

{

            int x,y,r;

            public:

                        void dim()

                        {

                                    cout<<"Enter the centre of the circle\n";

                                    cin>>x>>y;

                                    cout<<"Enter the radius of the circle\n";

                                    cin>>r;

                        }

                        void draw()

                        {

                                    circle(x,y,r);

                        }

};

void main()

{

            int choice;

            int gd=DETECT,gm;

            shape *ptr;

            circ c;

            rect r;

            triangle t;

            clrscr();

            while(1)

            {

                        cout<<"Enter your choice\n";

                        cout<<"1. Draw rectangle\n2. Draw Circle\n3. Triangle\n4. Exit\n";

                        cin>>choice;

                        switch(choice)

                        {

                                    case 1:

                                                ptr=&r;

                                                ptr->dim();

                                                initgraph(&gd,&gm,"c:\\tc\\bgi");

                                                ptr->draw();

                                                getch();

                                                closegraph();

                                                break;

                                    case 2:

                                                ptr=&c;

                                                ptr->dim();

                                                initgraph(&gd,&gm,"c:\\tc\\bgi");

                                                ptr->draw();

                                                getch();

                                                closegraph();

                                                break;

                                    case 3:

                                                ptr=&t;

                                                ptr->dim();

                                                initgraph(&gd,&gm,"c:\\tc\\bgi");

                                                ptr->draw();

                                                getch();

                                                closegraph();

                                                break;

                                    case 4:

                                                exit(0);

                                    default:

                                                cout<<"You entered a wrong choice\n";

                        }

            }

}

Posted Date: 9/29/2012 4:15:46 AM | Location : United States







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