A program in c for pendulum

#include<graphics.h>
#include<conio.h>
#include<dos.h>
#include<process.h>

int cx=300,cy=100,r=300;
int x=0,y,p;

int path(int dtn)
{
int x1,y1;
setcolor(15);
if(x>=y)
{
return 0;
}
cleardevice();

if(dtn==1)
{
circle(cx+x,cy+y,20);
line(cx,cy,cx+x,cy+y);
}
else
{
circle(cx-x,cy+y,20);
line(cx,cy,cx-x,cy+y);
}
delay(10);
if(kbhit())
exit(0);
x++;
if(p<0)
p+=2*x+1;
else
{
y--;
p+=2*(x-y)+1;
}
x1=x;
y1=y;
path(dtn);

cleardevice();
if(dtn==1)
{
circle(cx+x1,cy+y1,20);
line(cx,cy,cx+x1,cy+y1);
}
else
{
circle(cx-x1,cy+y1,20);
line(cx,cy,cx-x1,cy+y1);
}
delay(10);
if(kbhit())
exit(0);
}



void main()
{
int gd=DETECT,gm=DETECT;
initgraph(&gd,&gm,"");
cleardevice();
putpixel(300,100,4);
while(1)
{
x=0;
y=r;
p=1-r;
path(1);
x=0;
y=r;
p=1-r;
path(0);
}
getch();
}

Posted in: coding,computer graphics