using System;
class Test18{
    public static void Main(){
        string myInput;
        int myInt;
        begin:
            Console.Write("Please enter a number between 1 and 3:");
        myInput=Console.ReadLine();
        myInt=Int32.Parse(myInput);
        switch(myInt){
            case 1:
                Console.WriteLine("Your number is {0}.",myInt);
            break;
            case 2:
                Console.WriteLine("Your number is {0}.",myInt);
            break;
            case 3:
                Console.WriteLine("Your number is {0}",myInt);
            break;
            default:
                Console.WriteLine("Your number {0} is not between 1 and 3.",myInt);
            }
            decide:
                Console.Write("Type \"continue\" to go on or \"quit\" to stop:");
            myInput=Console.ReadLine();
            switch(myInput){
            case "continue":
                goto begin;
            case "quit":
                Console.WriteLine("Bye.");
            break;
            default:
            Console.WriteLine("Your input {0} is incorrect.",myInput);
            goto decide;
            }
    }
}
红色标记下面一定要加break？