Write a program to draw a circle using mid-point circle drawing algorithm.

#include<iostream.h>

#include<graphics.h>

#include<conio.h>

void drawcircle(int x0, int y0, int r)

{

                int x=r;

                int y=0

                int err=0;

                while(x>=y)

                {

                                putpixel(x0+x,y0+y,7);

                                putpixel(x0+y,y0+x,7);

                                putpixel(x0-y,y0+x,7);

                                putpixel(x0-x,y0+y,7);

                                putpixel(x0-x,y0-y,7);

                                putpixel(x0-y,y0-x,7);

                                putpixel(x0+y,y0-x,7);

                                putpixel(x0+x,y0-y,7);

                                if(err<=0)

                                {

                                                y+=1;

                                                err+=2*y+1;

                                }

                                if(err>0)

                                {

                                                x-=1;

                                                err-=2*x+1;

                                }

                }

}

int main()

{

                int gd=DETECT, gm, error,x,y,r;

                initgraph(&gd,&gm,"c:\\turboc3\\bgi");

                cout<<"Enter the radius of Circle :";

                cin>>r;

                cout<<"Enter values for center x and y :";

                cin>>x>>y;

                drawcircle(x,y,r);

                getch();

                return 0;

}