C++ Program to show animated pendulum clock in graphics

#include<math.h>
#include<process.h>
#include<dos.h>
#include<iostream.h>
#include<conio.h>
#include<graphics.h>
int x1=300,y1=180,x,y;
void display(double i)
{
circle(300,130,50);
line(210,60,210,320);
line(210,60,390,60);
line(390,60,390,320);
line(210,320,390,320);
outtextxy(295,88,"12");
outtextxy(260,130,"9");
outtextxy(340,130,"3");
outtextxy(295,168,"6");
line(300,130,300,98);
line(300,98,297,101);
line(300,98,303,101);
line(337,130,300,130);
line(337,130,334,127);
line(337,130,334,133);
x=x1+95*cos(i);
y=y1+95*sin(i);
line(x1,y1,x,y);
circle(x,y,10);
delay(30);
clearviewport();
}

void main()
{
int gd=DETECT,gm;
double i;
initgraph(&gd,&gm,"C:\\Tc\\BGI");
while(!kbhit())
{
for(i=2;i>1;i=i-0.01)
display(i);
for(i=1;i<2;i=i+0.01)
display(i);
}
getch();
}