using System;

public class Program

{

    public static void Main()

    {

//1. Create a console application that uses a (1) while and (2) a for loop to calculate the product of the first 10 and 20 integer numbers. Start at 1.

//   You will write 2 while and 2 for loop statement

// Using while (product of first 10)

    long sum = 1;

    int number = 1;

    while (number <=10)

    {

        sum *= number;

        number++;

    }

        Console.WriteLine(sum);

​

// Using while (product of first 20)

    long Tsum = 1;

    int Ti = 1;

    while (Ti <= 20)

    {

        Tsum *= Ti;

        Ti++;

    }

        Console.WriteLine(Tsum);

// Using for loop (product of first 10)

    long result = 1;

    int i; 

    for (i=1; i <=10; i++)

    {

        result *= i;

    }

        Console.WriteLine(result);

// Using for loop (product of first 20)

    long Tresult = 1;

    int Tnum; 

    for (Tnum=1; Tnum <=20; Tnum++)

    {

        Tresult *= Tnum;

    }

        Console.WriteLine(Tresult);

​

// 2. Given m=1777 and n =2022, what is the sum of the numbers between m and n (both included in the sum)?

//    Add this for loop to your program above

    long Gresult = 0;

    int Gi; 

​

    for (Gi=1777; Gi <= 2022; Gi++)

    {

        Gresult += Gi;

    }

        Console.WriteLine(Gresult);

    }

​

}