Flood Fill 4 connected Algorithm

 #include<graphics.h>
#include<stdio.h>
#include<conio.h>

void flood(int x, int y, int new_col, int old_col)
{

    if (getpixel(x, y) == old_col) {

	putpixel(x, y, new_col);
	flood(x + 1, y, new_col, old_col);
	flood(x - 1, y, new_col, old_col);
	flood(x, y + 1, new_col, old_col);
	flood(x, y - 1, new_col, old_col);
    }
}

int main()
{
    int gd=DETECT, gm;
    initgraph(&gd, &gm,"C:\\TURBOC3\\BGI");
    rectangle(50, 50, 100, 100);
    flood(51, 51, 12, 0);

    getch();
    closegraph();
    return 0;
}