This program calculates the factorial of an integer:

using namespace System;

long Factorial(long number)
{
    if( number <= 1 )
	return 1;
    else
	return number * Factorial(number - 1);
}

int main()
{
    Console::WriteLine(L"The factorial of 5 is: {0}\n",
		       Factorial(5));

    return 0;
}

This would produce:

The factorial of 5 is: 120

Press any key to continue . . .