Write a programme of Flood Fill Algorithm in C.

 Flood Fill Algorithm

#include<stdio.h>

#include<graphics.h>

#include<dos.h>

#include<conio.h>

 void floodFill(int x,int y,int oldcolor,int newcolor)

{

    if(getpixel(x,y) == oldcolor)

    {

        putpixel(x,y,newcolor);

        floodFill(x+1,y,oldcolor,newcolor);

        floodFill(x,y+1,oldcolor,newcolor);

        floodFill(x-1,y,oldcolor,newcolor);

        floodFill(x,y-1,oldcolor,newcolor);

    }

}

//getpixel(x,y) gives the color of specified pixel

 int main()

{

clrscr();

    int gm,gd=DETECT,radius;

    int x,y;

    printf("Enter x and y positions for circle\n");

    scanf("%d%d",&x,&y);

    printf("Enter radius of circle\n");

    scanf("%d",&radius);

    initgraph(&gd,&gm,"c:\\turboc3\\bgi");

    circle(x,y,radius);

    floodFill(x,y,0,15);

    delay(5000);

    closegraph();

    return 0;

getch();

}

output-