原题：利用接口做参数，写个计算器，能完成+-*/运算
1.定义一个接口ICompute含有一个方法int computer(int n,int m);
2.设计四个类分别实现次接口，完成+-*/运算；
3.设计一个类UseCompute含有方法：
public void useCom(ICompute com,int one,int two)
此方法要求能够
(1)用传递过来的对象调用computer方法完成运算
(2)输出运算的结果
测试调用UseCompute中的方法UseCom完成+-*/
==============================================
(以下命名空间为同一个，就不贴上来了)
interface ICompute
    {
        int Computer(int n,int m);
    }

class Plus : ICompute
    {
        public override int Computer(int n,int m)
        {
            int plus = n + m;
            return plus;
        }
    }

class Minus : ICompute
    {
        public override int Computer(int n, int m)
        {
            int minus = n - m;
            return minus;
        }
    }

class Times : ICompute
    {
        public override int Computer(int n, int m)
        {
            int times = n * m;
            return times;
        }
    }

class Devide : ICompute
    {
        public override int Computer(int n, int m)
        {
            int devide = n / m;
            return devide;
        }
    }
==问题出在设计UseComputer类这里，我不太理解题意（ICompute类型的参数要传什么）
==帮忙看看问题在哪，或应该怎样设置这个类
class UseComputer : ICompute
    {
        public void useCom(ICompute com, int one, int two)
        {

            Plus plus = new Plus();
            Minus minus = new Minus();
            Times times = new Times();
            Devide devide = new Devide();
            if (com == plus)
                (one, two);
            else if (com == minus)
                (one, two);
            else if (com == times)
                (one, two);
            else if (com == devide)
                (one,two);
        }
    }
//主程序
static void Main(string[] args)
        {
            UseComputer use = new UseComputer();
            use.useCom(plus, 5, 8);  //不知道题意是不是要这么应用，这里是报错
        }

报错的其中之一是我的语法
重写接口不用加override.
修改后相关错误解决
另外：

class UseComputer : ICompute
    {
        public void useCom(ICompute com, int one, int two)
        {
            Console.WriteLine((one,two));
        }
    }

static void Main(string[] args)
        {
            UseComputer use = new UseComputer();
            Plus plus = new Plus();
            Minus minus = new Minus();
            Times times = new Times();
            Devide devide = new Devide();
            use.useCom(plus, 5, 8);
         }

把声明对象步骤挪到Main中,程序能使用
请问有没有把声明对象步骤放入UseComputer中，程序还好使的方法！

思路有些问题，形容的非常准呵呵