.net（从控制台读入两个数，实现加减乘除）

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

namespace TestClaclulate
{
    class Program
    {
        static void Main(string[] args)
        {
            // 1，定义double变量
            double numberOne;
            double numberTwo;

            // 2，从控制台获得两个数
            try
            {
                numberOne = double.Parse(Console.ReadLine());
                numberTwo = double.Parse(Console.ReadLine());

                // 3，输出这两个数的加，减，乘，除 的结果
                Console.WriteLine(numberOne + " + " + numberTwo + " = " + (numberOne + numberTwo));
                Console.WriteLine(numberOne + " - " + numberTwo + " = " + (numberOne - numberTwo));
                Console.WriteLine(numberOne + " * " + numberTwo + " = " + (numberOne * numberTwo));
                Console.WriteLine(numberOne + " / " + numberTwo + " = " + (numberOne / numberTwo));
            }
            catch (System.FormatException e)
            {
                Console.WriteLine(e.Message);
            }

            //
            Console.ReadKey();
        }
    }
}