c#带记忆功能的计算器

你可以使用C#编写一个带记忆功能的计算器，实现基本的四则运算以及存储记忆功能。以下是代码示例：

using System;

namespace Calculator
{
    class Program
    {
        static void Main(string[] args)
        {
            double num1, num2, result = 0;
            string op;
            string choice = "y";
            double memory = 0;

            Console.WriteLine("Welcome to the calculator!");

            while (choice == "y")
            {
                Console.WriteLine("Enter first number:");
                num1 = Convert.ToDouble(Console.ReadLine());

                Console.WriteLine("Enter operator (+ - * /):");
                op = Console.ReadLine();

                Console.WriteLine("Enter second number:");
                num2 = Convert.ToDouble(Console.ReadLine());

                switch (op)
                {
                    case "+":
                        result = num1 + num2;
                        break;
                    case "-":
                        result = num1 - num2;
                        break;
                    case "*":
                        result = num1 * num2;
                        break;
                    case "/":
                        if (num2 == 0)
                        {
                            Console.WriteLine("Error: division by zero!");
                        }
                        else
                        {
                            result = num1 / num2;
                        }
                        break;
                    default:
                        Console.WriteLine("Invalid operator!");
                        break;
                }

                Console.WriteLine("Result: " + result);

                Console.WriteLine("Do you want to store this result in memory? (y/n)");
                string storeResult = Console.ReadLine();

                if (storeResult == "y")
                {
                    memory = result;
                }

                Console.WriteLine("Do you want to use memory? (y/n)");
                string useMemory = Console.ReadLine();

                if (useMemory == "y")
                {
                    Console.WriteLine("Memory: " + memory);
                }

                Console.WriteLine("Do you want to perform another calculation? (y/n)");
                choice = Console.ReadLine();
            }

            Console.WriteLine("Goodbye!");
        }
    }
}

这个计算器程序可以让用户输入两个数字和一个运算符，然后计算结果并输出。用户可以选择将结果存储在内存中，以便在以后使用。用户还可以从内存中检索上一个结果。程序还可以处理除以零的错误，并提示用户输入有效的运算符。