06.LoopsHomework/06.CalculateExpression

//Problem 6. Calculate N! / K!
//Write a program that calculates n! / k! for given n and k (1 < k < n < 100).
//Use only one loop.

using System;
using System.Numerics;
class CalculateExpression
{
    static BigInteger FactorialCalc(uint number)
    {
        BigInteger sum = 1;
        for (int i = 1; i <= number; i++)
        {
            sum = sum * i;
        }
        return sum;
    }

    static void Main()
    {
        Console.WriteLine("Calculate N!/K!");
        Console.Write("Enter N:");
        uint n = uint.Parse(Console.ReadLine());
        Console.Write("Enter K:");
        uint k = uint.Parse(Console.ReadLine());
        BigInteger result = FactorialCalc(n) / FactorialCalc(k);
        Console.Write("The Result is:{0}",result);
        Console.WriteLine();
    }
}