program of Circle using Mid Point algorithm

Code for header file “Myhdd.h”

#include <stdio.h>

#include <dos.h>

#include <graphics.h>

void cirMidpt(int, int, int);

void draw(int, int, int, int);

void cirMidpt(int xc, int yc, int r)

{

int x = 0, y = r;

int p = 1 - r;

while (x < y)

{

draw(xc, yc, x, y);

x++;

if (p < 0)

p = p + 2 * x + 1;

else

{

y--;

p = p + 2 * (x - y) + 1;

}

draw(xc, yc, x, y);

delay(50);

}

void draw(int xc, int yc, int x, int y)

{

putpixel(xc+x, yc+y, RED);

putpixel(xc-x, yc+y, RED);

putpixel(xc+x, yc-y, RED);

putpixel(xc-x, yc-y, RED);

putpixel(xc+y, yc+x, RED);

putpixel(xc-y, yc+x, RED);

putpixel(xc+y, yc-x, RED);

putpixel(xc-y, yc-x, RED);

}   

Code For Main Program  

 #include"Z:\myhdd.h"

#include <stdio.h>

int gd = DETECT, gm;

initgraph(&gd, &gm, "");

printf("Enter center coordinates of circle: ");

scanf("%d %d", &xc, &yc);

printf("Enter radius of circle: ");

scanf("%d", &r);

cirMidpt(xc, yc, r);

getch();

}  

OUTPUT: