using System;

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/* 

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  Name: Jordan Steinberg

  Username: jsteinb

  Date: 2/8/2022

  Title: Lab Day 8

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*/ 

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public class Program {

  public static void Main() {

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/*

  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 and write 2 for loops and 2 whiles 

*/ 

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  // 1. Product for first 10 integers using while loop 

    int i = 1;

    int prod = 1;

    while (i<=10)

    {

  // this operator multiplies the value on the left by the value on the right, storing the product as the value on the left (prod)

      prod *= i;

      i++;

    }

​

    Console.WriteLine ("The product of the first 10 integer numbers (inclusive) is: " + prod);

​

  // 2. Product for first 10 integers using for loop 

    prod = 1; 

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

    {

      prod *= i; 

    }

    Console.WriteLine ("The product of the first 10 integer numbers (inclusive) is: " + prod);

  // 3. Product for first 20 integers using while loops 

      i = 1;

      long prodo = 1;

      while (i<=20)

      {

          prodo *= i; 

          i++; 

      }

      Console.WriteLine ("The product of the first 20 integer numbers (inclusive) is: " + prodo);

  // 4. Product for first 20 integers using for loop 

      prodo = 1; 

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

      {  

          prodo *= i;

      } 

      Console.WriteLine ("The product of the first 20 integer numbers (inclusive) is: " + prodo);

​

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/* 

    2. 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)?

*/ 

      // Gauss 

      long result = 0; 

      int m; 

      // set m to 1777, add value to result, increment m by 1 until 2022 

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

      {

          result += m; 

      }

      Console.WriteLine("The sum of the numbers between m (1777) and n (2022) is: " + result);

  }

}

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