C++ program to show animated traffic signal (Simple graphics)

#include<iostream.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
void main()
{
clrscr();
int gd=0,gm;
initgraph(&gd,&gm,"C:\\Tc\\BGI");
rectangle(250,50,350,350);
circle(300,100,50);
circle(300,200,50);
circle(300,300,50);
line(80,80,80,500);
line(80,80,250,80);

while(!kbhit())
{
int x=100;
setfillstyle(1,RED);
floodfill(x+200,100,WHITE);
delay(500);
setfillstyle(1,BLACK);
floodfill(x+200,100,WHITE);
setfillstyle(1,YELLOW);
floodfill(x+200,200,WHITE);
delay(500);
setfillstyle(1,BLACK);
floodfill(x+200,200,WHITE);
setfillstyle(1,GREEN);
floodfill(x+200,300,WHITE);
delay(300);
setfillstyle(1,BLACK);
floodfill(x+200,300,WHITE);
}

getch();
closegraph();
}