using System;

public class Program

{

    public static void Main()

    {

        /*

        Part 1:

        Write a while and a for loop to calculate the product of the first 10 integer numbers

        starting at 1.

        Write a while and a for loop to calculate the product of the first 20 integer numbers

        starting at 1.

        After each loop print the parameters of the loop: starting number, ending number, and

        the result (product)

        */

        long product = 1;

        int end = 10;

        for (int i = 1; // init

             i <= end; // test

             i++) // avdvance

        {

            product = product * i;

        }       

        Console.WriteLine("The product of first {0} numbers is {1}", end, product);

        product = 1;

        end = 20;

        for (int i = 1; // init

             i <= end; // test

             i++) // avdvance

        {

            product = product * i;

        }       

        Console.WriteLine("The product of first {0} numbers is {1}", end, product);

        product = 1;

        end = 10;

        int num = 1;

        while (num <= end)

        {

            product *= num;

            num++;

        }       

        Console.WriteLine("The product of first {0} numbers is {1}", end, product);

        //For the Gauss in you: Given m=1777 and n=2022, what is the sum of the numbers between m and n (both included in the sum)?

        int m = 1777;

        int n = 2022;

        int sum = 0;

        // Loop 

        for (int i = m; 

             i <= n; 

             i++)

        {

            sum += i;

        }

        Console.WriteLine("The sum of numbers between " + m + " and " + n + " is: " + sum);

    }

}