WAP to draw a circle using Midpoint Circle Algorithm.

# include <iostream.h>
# include <conio.h>
# include <graphics.h>
# include <math.h>
void Circle(int radius,int xC,int yC);
void main()
{
    int gdriver=DETECT, gmode;
    initgraph(&gdriver,&gmode,"c:\\tc\\bgi");



    int Radius, xC, yC;
    printf("Enter Center point coordinates...");
    printf("xc:");
    scanf("%d",&xc)";
    printf("yc:");
    scanf("%d",&yc)";
    printf("Radius:");
    scanf("%d",&radius)";
    cleardevice();
    Circle(Radius,xC,yC);
    /* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");

   /* read result of initialization */
   errorcode = graphresult();
   /* an error occurred */
   if (errorcode != grOk)
   {
      printf("Graphics error: %s\n", grapherrormsg(errorcode));
      printf("Press any key to halt:");
      getch();
      exit(1);
   }

    return;
}
void Circle(int radius,int xC,int yC)
{
    int P;
    int x,y;
    void Draw(int x,int y,int xC,int yC);
    P = 1 - radius;
    x = 0;
    y = radius;
    Draw(x,y,xC,yC);
    while (x<=y)
    {
        x++;
        if (P<0)
        {
            P += 2 * x + 1;
        }
        else
        {
            P += 2 * (x - y) + 1;
            y--;
        }
        Draw(x,y,xC,yC);
    }

}
void Draw(int x,int y,int xC,int yC)
{
    putpixel(xC + x,yC + y,15);
    putpixel(xC + x,yC - y,15);
    putpixel(xC - x,yC + y,15);
    putpixel(xC - x,yC - y,15);
    putpixel(xC + y,yC + x,15);
    putpixel(xC - y,yC + x,15);
    putpixel(xC + y,yC - x,15);
    putpixel(xC - y,yC - x,15);
}

Output: