using System;

public class Program

{

    public static void Main()

    {

        /* 

        Problem 1

        Problem 2:

        No, if you have duplicate cases in a switch, the second case will never be executed.

        Problem 3:

        No, the values of a case must be constant or literal, no variables count. 

        */

        Console.WriteLine("Please enter your major");

        string strMajor = Console.ReadLine();

        Console.WriteLine("Please enter the whole number grade of your most recent assignment");

        int intNumber;

        string strInput = Console.ReadLine();

        bool IsValidNumber = Int32.TryParse(strInput, out intNumber);

        if (IsValidNumber == false)

            Console.WriteLine("Please enter a whole number");

            return;

            Console.WriteLine("Valid whole number is {0}", intNumber);