using System;

​

namespace calcGrade

{

    class Program

    {

        public static void Main(string[] args)

        {

            //variable declaration

            string strUser;

            int intGrade;

            string strGrade="n/a";

            string strOwn="";  

            Random rndTool = new Random();

            //input

            System.Console.WriteLine("Would you like to enter your own grade? (y/n)");

            strUser = System.Console.ReadLine();

            strOwn = strUser;

            if (strUser == "y")

            {

                System.Console.WriteLine("Enter your grade: ");

                strUser = System.Console.ReadLine();

                intGrade = Int32.Parse(strUser);

            }

            else

            {

                intGrade = rndTool.Next(0,101);

            }

            //process

            if (intGrade>=0 && intGrade < 50)

            {

                strGrade = "F";

            }

            else if(intGrade >=50 && intGrade<60)

            {

                strGrade = "D";

            }

            else if (intGrade >=60 && intGrade < 70)

            {

                strGrade = "C";

            }

            else if (intGrade >= 70 && intGrade < 80)

            {

                strGrade = "B";

            }

            else if (intGrade >= 80 && intGrade < 90)

            {

                strGrade = "A";

            }

            else if (intGrade >= 90 && intGrade < 101)

            {

                strGrade = "RH King B";

            }

            else

            {

                strGrade = "N/A";

            }

            //output

            System.Console.WriteLine("Your number grade of "+intGrade+" is "+strGrade + " in Letter Grade");

        }

    }

}