Cara Membuat Faktorial

#include<iostream.h>
#include<conio.h>
void main()
{
int bil, n;
long int hasil;
cout<<"n = ";
cin>> n;

hasil=1;
for(bil=n; bil>=1;bil--)
{
hasil=hasil*bil;
}
cout<<"n!= "<<hasil<<"\n";
getch();
}