using System;

public class Program

{

    public static void Main()

    {

        int x = 1;

        switch(x){

            case 4: Console.WriteLine("Excellent");

                break; // break:中斷現有的執行

            case 3: Console.WriteLine("Good");

                break;

            case 2: Console.WriteLine("Average");

                break;

            case 1: Console.WriteLine("Poor");

                break;

            case 0: Console.WriteLine("Failing");

                break;

            default: Console.WriteLine("Illigal Grade");

                break;

        }

    }

}