Factorial using function in C++

#include<iostream>

#include<conio.h>

using namespace std;

long factorial(int);

int main()

{

     int counter, n;

     cout<<"Enter the Number :";

     cin>>n;

     cout<<n<<" Factorial Value Is "<<factorial(n);

     getch();

     return 0;

 }

long factorial(int n)

{

    int counter;

    long fact = 1;

     for (int counter = 1; counter <= n; counter++)

     {

         fact = fact * counter;

     }

  return fact;

}