ELLIPSE PROGRAM IN C (GRAPHICS)

#include<stdio.h>

#include<conio.h>

#include<graphics.h>
#include<math.h>
#include<stdlib.h>
void setpixel1(int,int,int,int);   
   
   
   
   
   
    int main()
    {
       int gd=DETECT,gm;
       initgraph(&gd,&gm," ");
       int xc,yc,a,b;
       int my,my1,my2,my3,x,y,p,fx,fy;
       printf("\n\n Enter xc:");
       scanf("%d",&xc);
         printf("\n\n Enter yc:");
       scanf("%d",&yc);
         printf("\n\n Enter major axis a:");
       scanf("%d",&a);
         printf("\n\n Enter minor axis b:");
       scanf("%d",&b);
       x=0;
       y=b;
       my=a*a;
        my1=b*b;
       my2=aa*2;
       my3=bb*2;
       fx=0;
       fy=my*b;
       p=(my1)-(my*b)+(0.25*my)
       setpixel1(xc,yc,x,y);
       while(fx<fy)
       {
         x++;
         fx=fx+my3;
         if(p<0)
         {
           p=p+fx+my1;
         }
         else
         {
           y--;
           fy=fy-my2;
           p=p+fx+my1-fy;
         }
         setpixel1(xc,yc,x,y);
       }
       p=(my1*(x+0.5)*(x+0.5))+(my*(y-1)*(y-1))-(my*my1);
       while(y>0)
       {
         y--;
         fy=fy-my2;
         if(p>=0)
         {
           p=p+my-fy;
         }
         else
         {
             x++;
             fx=fx+my3;
             p=p+my+fx-fy;
         }
         setpixel1(xc,yc,x,y);
                 }
       getch();
      
       closegraph();
       return 0;
      
    }

void setpixel1(int xc, int yc, int x, int y)
{
    putpixel(xc+x, yc+y,11);
    putpixel(xc-x, yc+y,11);
    putpixel(xc+x, yc-y,11);
    putpixel(xc-x, yc-y,11);
}