简单代码 //输入两个数加减乘除。

static void Main()
   {
    //输入两个数加减乘除。
    Console.WriteLine("请输入第一个整数：");
    double a = double.Parse(Console.ReadLine());
    Console.WriteLine("请输入第二个整数：");
    double b = double.Parse(Console.ReadLine());
    double sum = a+b;
    double rdu = a-b;
    double d = a*b;
    double c = a/b;
    Console.WriteLine("{0}+{1}={2}",a,b,sum);
    Console.WriteLine("{0}-{1}={2}",a,b,rdu);
    Console.WriteLine("{0}*{1}={2}",a,b,d);
    Console.WriteLine("{0}/{1}={2}",a,b,c);
   }
  }