//Program to find factoral of a number
#include<iostream.h>
unsigned long int fact(unsigned int);
int main()
{
int a;
cout<<"Enter a number : ";cin>>a;
cout<<a<<"! = "<<fact(a)<<endl;
return 0;
}

unsigned long int fact(unsigned int n)
{
unsigned long int fact=1;
while (n>0)
{
 fact*=n;
n--;
}
return fact;
}