Draw a Circle : Mid-Point Algorithm

C Program

#include<graphics.h>
#include<conio.h>
#include<stdio.h>
void plotpoints(int x, int y, int cx, int cy) {
 putpixel(cx + x, cy + y, 4);
 putpixel(cx - x, cy + y, 4);
 putpixel(cx + x, cy - y, 4);
 putpixel(cx - x, cy - y, 4);
 putpixel(cx + y, cy + x, 4);
 putpixel(cx - y, cy + x, 4);
 putpixel(cx + y, cy - x, 4);
 putpixel(cx - y, cy - x, 4);
}
void main() {
 int cx, cy, x = 0, y, r, p;
 int gd = DETECT, gm = DETECT;
 clrscr();
 printf("Enter the center \n");
 scanf("%d%d", &cx, &cy);
 printf("Enter the radius : ");
 scanf("%d", &r);
 y = r;
 p = 1 - r;
 initgraph(&gd, &gm, "");
 cleardevice();
 while (x < y) {
  plotpoints(x, y, cx, cy);
  x++;
  if (p < 0)
       p += 2 * x + 1; else {
   y--;
   p += 2 * (x - y) + 1;
  }
 }
 getch();
}