复制代码 代码如下:

using System;

class ChooseSubject

{

static void Main()

{

int i;

string str;

Console.WriteLine ("Please choose your favorite subjects:-1 is quit.");

Console.WriteLine ("1.Chinese.");

Console.WriteLine ("2.Maths.");

Console.WriteLine ("3.English.");

Console.WriteLine ("4.Physical.");

Console.WriteLine ("-1 is quit.");

do

{

str=Console.ReadLine ();

i=Int32.Parse (str);

switch(i)

{

case 1:

Console.WriteLine ("You like chinese very much.");

break;

case 2:

Console.WriteLine ("You like maths very much.");

break;

case 3:

Console.WriteLine ("You like english very much.");

break;

case 4:

Console.WriteLine ("You like physical very much.");

break;

case -1:

break;

default:

Console.WriteLine ("I'm sorry.You can't choose this subject.");

break;

}

}while(i!=-1);

Console.WriteLine ("Byebye!");

}

}