C#如何使用带开关的枚举 [英] C# how to use enum with switch

问题描述

我不知道如何将开关与枚举结合使用.你能告诉我我做错了什么，以及如何解决它?我必须使用枚举来制作一个基本的计算器.

I can't figure out how to use switches in combination with an enum. Could you please tell me what I'm doing wrong, and how to fix it? I have to use an enum to make a basic calculator.

public enum Operator
{
    PLUS, MINUS, MULTIPLY, DIVIDE
}

public double Calculate(int left, int right, Operator op)
{

    int i = (int) op;

    switch(i)
    {
        case 0:
        {
            return left + right;
        }

        case 1:
        {
            return left - right;
        }

        case 2:
        { 
            return left * right;
        }

        case 3:
        {
            return left / right;
        }

        default:
        {
            return 0.0;
        }
    }
}

最终结果应该是这样的:

The end result should be something like this:

Console.WriteLine("The sum of 5 and 5 is " + Calculate(5, 5, PLUS))
Output: The sum of 5 and 5 is 10

你们能告诉我我是怎么搞砸的吗?

Could you guys please tell me how I'm messing up?

推荐答案

不需要转换

switch(op)
{
     case Operator.PLUS:
     {
        // your code 
        // for plus operator
        break;
     }
     case Operator.MULTIPLY:
     {
        // your code 
        // for MULTIPLY operator
        break;
     }
     default: break;
}

顺便说一下，使用括号

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