C# 控制台应用程序中的简单计算器 class

Question

我是 c# 的初学者，我有作业，所以我需要你的帮助，这是我现在所做的，

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SimpleCalculator{

    class SimpleCalculator {

        double number1;
        double number2;
        double result;
        double stored;
        Boolean isStored; 

        public SimpleCalculator()  {}

        public double Add()
        {
            result = (this.number1 + this.number2);
            return result;
        }
        public double Subtract()
        {
            result = (this.number1 - this.number2);
            return result;
        }
        public double Multiply()
        {
            result = (this.number1 * this.number2);
            return result;
        }
        public double Divide()
        {
            result = ((this.number1) /( this.number2));
            return result;
        }
        public double SquareRootNumber1()
        {
            result = Math.Sqrt(this.number1);
            return result;
        }
        public double SquareRootNumber2()
        {
            result = Math.Sqrt(this.number2);
            return result;
        }
        public Boolean isMemoryUsed()
        {
            if (this.stored == 0){
                this.isStored=false ;
                return isStored;
            }
            else              
                this.isStored = true;          
            return this.isStored;
        }
        public double  MemoryStore(double paramater_store1) {
            this.stored = this.stored + paramater_store1;
            return this.stored;        
        }
        public double MemoryRecall()
        {       
            if (MemoryStore(this.stored)==0)
                return 0;  
            else 
                return MemoryStore(this.stored);       
        }
        public double MemoryAdd(double paramater_store2)
        {
            this.stored = this.stored + paramater_store2 ;
            return this.stored;
        }
        public double MemorySubtract(double paramater_store3)
        {
            this.stored = this.stored - paramater_store3;
            return this.stored;
        }
        public double MemoryClear()
        {
            return this.stored = 0;
        }

        static void Main(string[] args)
        {

            SimpleCalculator calc = new SimpleCalculator();
            calc.number1 = 3.14; 
            calc.number2 = 5.78;
            Console.WriteLine("A is {0}", calc.number1);
            Console.WriteLine("B is {0}", calc.number2);
            double result = calc.Add();
            Console.WriteLine("A + B = {0}", result);
            result = calc.Subtract();
            Console.WriteLine("A - B = {0}", result);
            result = calc.Multiply();
            Console.WriteLine("A * B = {0}", result);
            Console.WriteLine("Sqrt(A) = {0}", calc.SquareRootNumber1());
            Console.WriteLine("Sqrt(B) = {0}", calc.SquareRootNumber2());
            Console.WriteLine("A = {0}", calc.number1);
            Console.WriteLine("B = {0}", calc.number2);

            try
            {
                result = calc.Divide(); 
                Console.WriteLine("A / B = {0}", result);
            }
            catch (Exception ex) 
            {
                Console.WriteLine(ex.Message);
            }

            calc.number1=3.14;
            calc.number2=0 ;
            Console.WriteLine("A is {0} ", calc.number1);
            Console.WriteLine("B is {0} ", calc.number2);
            result = calc.Divide();

            try { 
                result = calc.Divide();
                Console.WriteLine("A / B = {0}", result);
            }
            catch (Exception ex) {
                Console.WriteLine("The divisor can’t be zero ",ex.Message);
            }

            Console.WriteLine("Is memory being used at the beginning? {0}", calc.isMemoryUsed());
            calc.MemoryStore(3.16);
            Console.WriteLine("Is memory being used after MemoryStore? {0}", calc.isMemoryUsed()); 
            Console.WriteLine("Memory = {0}", calc.MemoryRecall());
            calc.MemoryAdd(5.67);
            Console.WriteLine("Is memory being used after MemoryAdd? {0}", calc.isMemoryUsed()); 
            Console.WriteLine("Memory = {0}", calc.MemoryRecall());
            calc.MemorySubtract(7.89);
            Console.WriteLine("Is memory being used after MemorySubtract? {0}", calc.isMemoryUsed());
            Console.WriteLine("Memory = {0}", calc.MemoryRecall());
            calc.MemoryClear();
            Console.WriteLine("Is memory being used after MemoryClear? {0}", calc.isMemoryUsed());
            calc.MemoryAdd(5.67);
            Console.WriteLine("Is memory being used after MemoryAdd? {0}", calc.isMemoryUsed());
            Console.WriteLine("Memory = {0}", calc.MemoryRecall());
            calc.MemoryClear();
            Console.WriteLine("Is memory being used after MemoryClear? {0}",      calc.isMemoryUsed());
            calc.MemorySubtract(7.89);
            Console.WriteLine("Is memory being used after MemorySubtract? {0}", calc.isMemoryUsed()); 
            Console.WriteLine("Memory = {0}", calc.MemoryRecall());
        }
    }
}

问题是，我得到了错误的结果：this is my result but the answers must be different!! ！！！！！！ BUT, It should be like this 有一些方法应该具有这些特征：
以下是一些重要问题：

 Add() 方法将 Number1 和 Number2 相加，return返回结果。

 Subtract() 方法从 Number1 中减去 Number2，然后 return 返回结果。

 Multiply() 方法将 Number1 和 Number2 相乘，然后 return 返回结果。

 Divide() 方法检查 Number2 是否为零。如果 Number2 为零，它应该抛出异常并显示消息“无法完成除法，因为 Number2 为零！”。如果 Number2 不为零，它应该 return 返回除法结果。

 SquareRootNumber1() 和 SquareRootNumber2() 方法 return 分别计算 Number1 和 Number2 的平方根。

 如果计算器内存中存在存储值，isMemoryUsed() 方法应 return 为真，如果内存中没有存储值，则为假。

 MemoryStore(double) 方法将参数值存储到内存中。

 MemoryRecall() 方法 return 返回内存的值。如果内存中没有存储值，它应该 return 零。

 MemoryAdd(double) 方法将参数值添加到内存中。

 MemorySubtract(double) 方法从内存中减去参数值。

 MemoryClear() 方法清除内存中的值。

 当调用 MemoryStore、MemoryAdd 和 MemorySubtract 方法时，一个值存储在内存中，然后 isMemoryUsed() 方法应该 return 为真。调用 MemoryClear() 方法后，isMemoryUsed() 方法应该 return false。 MemoryRecall() 方法不会更改由 isMemoryUsed() 方法 return 编辑的值。

 您的程序应该给出与上面给出的程序相同的输出。

 仔细指定成员变量及其可见性（public 或私有）。

Answer 1

想不到的结果是你考过记忆对不对？

1）MemoryStore不存储参数，它把参数添加到当前内存内容中，是不是你想要的？

2）回忆记忆是这样写的：

public double MemoryRecall()
{       
    if (MemoryStore(this.stored)==0)
        return 0;  
    else 
        return MemoryStore(this.stored);       
}

等同于：

public double MemoryRecall()
{ 
    return MemoryStore(this.stored);       
}

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