BoundaryFill

#include<stdio.h>
#include<math.h>
#include<conio.h>
#include<graphics.h>
void bound(int x,int y,int fillcolor,int bcolor){
    int color=getpixel(x,y);
    if(color!=fillcolor && color != bcolor){
        putpixel(x,y,fillcolor);
        bound(x+1,y,fillcolor,bcolor);
        bound(x-1,y,fillcolor,bcolor);
        bound(x,y-1,fillcolor,bcolor);
        bound(x,y+1,fillcolor,bcolor);
    }
}

void main(){
    clrscr();
    int gd=DETECT,gm;
    initgraph(&gd,&gm,"C:\\TC\\bgi");
    line(300,300,350,300);
    line(300,300,300,350);
    line(300,350,350,350);
    line(350,300,350,350);
    bound(310,310,MAGENTA,BLUE);
    getch();
}