C#加减乘除
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Ch03Ex02 { class Program { static void Main(string[] args) { double firstNumber, secondNumber; string userName; Console.WriteLine("请输入姓名:"); userName = Console.ReadLine(); Console.WriteLine("请输入第一个数字:"); firstNumber = Convert.ToDouble(Console.ReadLine()); Console.WriteLine("请输入第二个数字:"); secondNumber = Convert.ToDouble(Console.ReadLine()); Console.WriteLine("数字{0}加{1}结果是:{...
