using System;

public class Program

{

    public static void Main()

    {

        // in j = 0;

        // while (j < 10)

        // {    

        //      j--;

        // }

        //

        // Could you explain while the loop above will never stop?

        /* because it is < 10 and the math is a difference. So when the code run, j will infinitely decrease and go negative as long as the condition 

        does not stop it*/ 

        // Your first assignment:

        // Modify the student score program so that at the end of the program,

        // The user will be asked if they want to enter another student score

        // If the user answers yes, go back to the beginning of the program and process a new input test score from the user

        // If not, say goodbye and terminate the program

        bool run = true; 

        while (run)

        {

            int score;

            Console.WriteLine("Please insert student's test score:");

            score = Convert.ToInt32(Console.ReadLine()); 

            Console.WriteLine("Student test score is {0} ", score); 

            Console.Write("\n\n");

            string comment = null;

            string grade = null;

            if (91 <= score && score <= 100)

            {

                comment = "Excellent";

                grade = "A";

            }

            else if (81 <= score && score <= 90)

            {

                comment = "Good";

                grade = "B";

            }

            else if (71 <= score && score <= 80)

            {

                comment = "OK";

                grade = "C";

            }

            else if (61 <= score && score <= 70)

            {

                comment = "Bad";

                grade = "D";

            }

            else if (51 <= score && score <= 60)

            {

                comment = "Terrible";

                grade = "E";

            }

            else

            {

                comment = "Fail";

                grade = "F";

            }

            Console.WriteLine("Comment: " + comment);

            Console.WriteLine("Grade: " + grade);

            Console.WriteLine("Do you want to add another student score? (yes or no question)");    

            string answer = Console.ReadLine();

            run = answer == "yes";

        }

    }

}