C CODE for seedfill algorithm

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
void boundary_fill(int x,int y,int fill_color,int boun_color)
{
    int color;
    color=getpixel(x,y);
    if(color!=fill_color && color!=boun_color)
    {
        boundary_fill(x-1,y,fill_color,boun_color);
        boundary_fill(x+1,y,fill_color,boun_color);
        boundary_fill(x,y-1,fill_color,boun_color);
        boundary_fill(x,y+1,fill_color,boun_color);
    }
    delay(30);
}
void main()
{
    int gd=0,gm,fill=9,boun=15,x1,y1;
    initgraph(&gd,&gm,"");
    x1=5;
    y1=5;
    line(0,240,640,240);
    line(320,0,320,480);
    rectangle(320,225,325,240);
    boundary_fill(x1,y1,fill,boun);
    getch();
    closegraph();
}