Question

Write a C# console application that reads a student’s grade and displays the letter grade. It should validate the input before processing it, i.e. if the input is negative or more than 100, output an error message and stop the program. If the input is not a number, output an error message and stop the program, too. There is one requirement: to determine the letter grade , use “ switch…case “

Answer 1

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using System;

public class GradeExcercise{

    public static void Main(){

        int grade;

        Console.Write("Enter student's grade: ");

        try{

            grade = Int32.Parse(Console.ReadLine());

        }catch(FormatException){

            Console.WriteLine("Grade must be integer!");

            return;

        }

        if(grade<0 || grade>100){

            Console.WriteLine("Invalid grade! grade must between 0 to 100");

            return;

        }

        char letterGrade;

        switch(grade/10){

            case 10:

            case 9:

                letterGrade = 'A';

                break;

            case 8:

                letterGrade = 'B';

                break;

            case 7:

                letterGrade = 'C';

                break;

            case 6:

                letterGrade = 'D';

                break;

            default:

                letterGrade = 'F';

                break;

        }

        Console.WriteLine("Student's grade {0}, Letter Grade: {1}", grade, letterGrade);

    }

}