使用case练习

using System;
using System.Collections.Generic;
using System.Text;

namespace _._7练习_三_计算机练习
{
    class Program
    {
        static void Main(string[] args)
        {
            //下面是一个while循环
            string str = "Y";//先声明变量等于空值
            while (str == "Y" || str == "y")
            {

                //下面是主程
                int num1 = Convert.ToInt32(Console.ReadLine());
                int num2 = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine("选择要进行的操作，+代表相加，-代表相减，*代表相乘，/代表相除");
                string operater = Console.ReadLine();
                switch (operater)//判断operater是否加减乘除
                {
                    case "+":
                        Console.WriteLine("相加的结果为：" + (num1 + num2).ToString());
                        break;

                    case "-":
                        Console.WriteLine("相减的结果为：" + (num1 - num2).ToString());
                        break;
                    case "*":
                        Console.WriteLine("相乘的结果为：" + (num1 * num2).ToString());
                        break;
                    default:
                        Console.WriteLine("相除的结果为：" + (num1 / num2).ToString());
                        break;

                }
                //Console.Read();有while时这里可以不要
                Console.WriteLine("是否继续进行计算，Y代表继续，N代表退出");
                str = Console.ReadLine();//重新给str赋值

            }//while循环括号
          
        }
    }
}