Declaration of fillellipse function :-
void fillellipse(int x, int y, int xradius, int yradius);
x and y are coordinates of center of the ellipse, xradius and yradius are x and y radius of ellipse respectively.
C program for fillellipse
#include <graphics.h>
#include <conio.h>
#include <conio.h>
int main()
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:\\TC\\BGI");
fillellipse(100, 100, 50, 25);
getch();
closegraph();
return 0;
}