C Program for MidPoint Circle Drawing Algorithm

#include< stdio.h>
#include< graphics.h>
#include< conio.h>
void MID_POINT_CIRCLE(int x,int y,int r);
void circlePlot(int,int,int,int);
void main()
{
 int x,y,r,gdriver=DETECT,gmode;
 clrscr();
 initgraph(&gdriver,&gmode,"");

 printf("\nEnter point(x,y):");
 scanf("%d %d",&x,&y);
 printf("\nEnter radius:");
 scanf("%d",&r);
 MID_POINT_CIRCLE(x,y,r);
 getch();

}
void MID_POINT_CIRCLE(int xCen,int yCen,int r)
{
 int x=0;
 int y=r;
 int p=1-r;


 circlePlot(xCen,yCen,x,y);

 while(x < y)
 {
  x++;
  if(p < 0)
   p+=(2*x)+1;
  else
  {
   y--;
   p+=2*(x-y)+1;
  }
  circlePlot(xCen,yCen,x,y);
 }

}

void circlePlot(int xCen,int yCen,int x,int y)
{
 putpixel(xCen+x,yCen+y,WHITE);
 putpixel(xCen-x,yCen+y,WHITE);
 putpixel(xCen+x,yCen-y,WHITE);
 putpixel(xCen-x,yCen-y,WHITE);
 putpixel(xCen+y,yCen+x,WHITE);
 putpixel(xCen-y,yCen+x,WHITE);
 putpixel(xCen+y,yCen-x,WHITE);
 putpixel(xCen-y,yCen-x,WHITE);
}

OUTPUT