breshenhamcircle.C

#include<stdio.h>
#include<graphics.h>
void drawcircle(int x0, int y0, int radius)
{ int x = radius;
 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 gdriver=DETECT, gmode, error, x, y, r;
initgraph(&gdriver, &gmode, "c:\\turboc3\\bgi");
printf("Enter radius of circle: ");
scanf("%d", &r);
printf("Enter co-ordinates of center(x and y): ");
	scanf("%d%d", &x, &y);
	drawcircle(x, y, r);
	       getch();
	return 0;}