using System;

public class Program

{

    public static void Main()

    {

//1. Can you use the Switch statement for a Double type? Why (why not)? No, you cannot use Double within Switch statement as case values because numbers can be represented different based on the precision level within binary. 

​

//2. Can you have duplicate cases in a Switch? - No, you cannot have duplicate cases in a Switch because C# will not know which option to select and it does not make sense.

​

//3. Can you use a variable in the case? i.e., Instead of “case 0:” have “case x:” - No, you must use constants in cases and cannot use variables.

​

//4. Write the following program

    //1.Get a string from the user (this string represents a student’s major.)

        Console.WriteLine("What is your major in school?");

        string strMajor = Console.ReadLine();

    //2.Get a number from a user (this number represents a student’s score.)

        Console.WriteLine("What is your score?");

        string strScore = Console.ReadLine();

        int intScore;

    //3.Validate whether the score is a whole number. If not, show an error message.

        bool IsValidNumber = Int32.TryParse(strScore, out intScore);

        if (!IsValidNumber)

        {

            Console.WriteLine("Error: Please enter a valid number!");

            return;

        }

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

    //4.Validate whether the score’s range is between 0 and 100. If not, show an error message.

        if (intScore < 0 || intScore > 100)

        {

            Console.WriteLine("Error: Please enter a number between 0 and 100!");

            return;

        }

        Console.WriteLine("Number {0} is between 0 and 100", intScore);      

    /*5.Show the following information based on the score.

        Score: >= 90, show "You get A ".

        Score: 80 ~ 89, show "You get B ".

        Score: 70 ~ 79, show "You get C".

        Score: 60 ~ 69, show "You get D".

        Score: < 60, show  "You get F".

        For an individual's score greater than 90, check his/her major

        Show "Congratulations! You are one of the best students in IS." if the major is "Information Systems"

        Show "Congratulations! You are one of the best students.” for other majors. */  

        if ( intScore >= 90)

        {

            Console.WriteLine("You get A");

            if (strMajor == "Information Systems")

            {

                Console.WriteLine("Congratulations! You are one of the best students in IS.");

            }   

            else 

            {

                Console.WriteLine("Congratulations! You are one of the best students.");

            }

        }   

        else if ( intScore >= 80)

        {

            Console.WriteLine("You get B");

        }   

        else if ( intScore >= 70)

        {

            Console.WriteLine("You get C");

        }   

        else if ( intScore >= 60)

        {

            Console.WriteLine("You get D");

        }

        else 

        {

            Console.WriteLine("You get F");

        }           

    }

}