用委托c#基于委托实现一个计算器功能的实例

下面是一个使用委托实现简单计算器功能的 C# 实例：

using System;

namespace Calculator
{
    class Program
    {
        delegate double MathOperation(double x, double y);

        static void Main(string[] args)
        {
            Console.WriteLine("请输入两个数字和运算符，以空格分隔：");
            string[] input = Console.ReadLine().Split(' ');

            double num1 = double.Parse(input[0]);
            double num2 = double.Parse(input[1]);
            string op = input[2];

            MathOperation operation = null;

            switch (op)
            {
                case "+":
                    operation = new MathOperation(Add);
                    break;
                case "-":
                    operation = new MathOperation(Subtract);
                    break;
                case "*":
                    operation = new MathOperation(Multiply);
                    break;
                case "/":
                    operation = new MathOperation(Divide);
                    break;
                default:
                    Console.WriteLine("无效的运算符！");
                    break;
            }

            if (operation != null)
            {
                double result = operation(num1, num2);
                Console.WriteLine("计算结果：{0}", result);
            }

            Console.ReadLine();
        }

        static double Add(double x, double y)
        {
            return x + y;
        }

        static double Subtract(double x, double y)
        {
            return x - y;
        }

        static double Multiply(double x, double y)
        {
            return x * y;
        }

        static double Divide(double x, double y)
        {
            if (y == 0)
            {
                Console.WriteLine("除数不能为零！");
                return 0;
            }

            return x / y;
        }
    }
}

该程序首先要求用户输入两个数字和一个运算符，然后根据运算符选择相应的委托函数，最后将两个数字传递给委托函数并输出结果。注意，除法运算需要特殊处理除数为零的情况。