MIDPOINT Circle

#include<graphics.h>
#include<stdio.h>
#include<time.h>
int main()
{
int gd=DETECT,gm;
int i,r,x,y,xc,yc;
float d;
printf("Enter Radius\n");
scanf("%d",&r);
printf("Enter Center of circle\n");

scanf("%d",&xc);
scanf("%d",&yc);
initgraph(&gd,&gm,NULL);
line(0,240,640,240);
   line(320,0,320,480);
     xc = 320 + xc;
   yc = 240 - yc;
putpixel(xc,yc,RED);
d=1.25-r;
x=0;
y=r;
do
{
if(d<0)
{
x=x+1;
d=d+2*x+1;
}
else
{
x=x+1;
y=y-1;
d=d+2*x-2*y+10;
}
usleep(100000);
putpixel(xc+x,yc+y,1);
putpixel(xc-y,yc-x,2);
putpixel(xc+y,yc-x,3);
putpixel(xc-y,yc+x,4);
putpixel(xc+y,yc+x,5);
putpixel(xc-x,yc-y,6);
putpixel(xc+x,yc-y,7);
putpixel(xc-x,yc+y,8);
}
while(x<y);
getch();
}