Реализация памяти в калькуляторе

#pragma once
#include <math.h>
 
double mem(0);
namespace calc {
 
    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System::Data;
    using namespace System::Drawing;
 
    /// <summary>
    /// Summary for Form1
    /// </summary>
    public ref class Form1 : public System::Windows::Forms::Form
    {
    public:
        Form1(void)
        {
            InitializeComponent();
            //
            //TODO: Add the constructor code here
            //
        }
 
    protected:
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        ~Form1()
        {
            if (components)
            {
                delete components;
            }
        }
    private: System::Windows::Forms::TextBox^  textBox1;
    protected: 
    private: System::Windows::Forms::TextBox^  textBox2;
    private: System::Windows::Forms::TextBox^  textBox3;
    private: System::Windows::Forms::Label^  label1;
    private: System::Windows::Forms::Label^  label2;
    private: System::Windows::Forms::Label^  label3;
    private: System::Windows::Forms::Button^  button1;
    private: System::Windows::Forms::Button^  button2;
    private: System::Windows::Forms::Button^  button3;
    private: System::Windows::Forms::Button^  button4;
    private: System::Windows::Forms::Button^  button5;
    private: System::Windows::Forms::Button^  button6;
    private: System::Windows::Forms::Button^  button7;
    private: System::Windows::Forms::Button^  button8;
    private: System::Windows::Forms::Button^  button9;
    private: System::Windows::Forms::Button^  button10;
    private: System::Windows::Forms::TextBox^  textBox4;
 
    private:
        /// <summary>
        /// Required designer variable.
        /// </summary>
        System::ComponentModel::Container ^components;
 
#pragma region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        void InitializeComponent(void)
        {
            this->textBox1 = (gcnew System::Windows::Forms::TextBox());
            this->textBox2 = (gcnew System::Windows::Forms::TextBox());
            this->textBox3 = (gcnew System::Windows::Forms::TextBox());
            this->label1 = (gcnew System::Windows::Forms::Label());
            this->label2 = (gcnew System::Windows::Forms::Label());
            this->label3 = (gcnew System::Windows::Forms::Label());
            this->button1 = (gcnew System::Windows::Forms::Button());
            this->button2 = (gcnew System::Windows::Forms::Button());
            this->button3 = (gcnew System::Windows::Forms::Button());
            this->button4 = (gcnew System::Windows::Forms::Button());
            this->button5 = (gcnew System::Windows::Forms::Button());
            this->button6 = (gcnew System::Windows::Forms::Button());
            this->button7 = (gcnew System::Windows::Forms::Button());
            this->button8 = (gcnew System::Windows::Forms::Button());
            this->button9 = (gcnew System::Windows::Forms::Button());
            this->button10 = (gcnew System::Windows::Forms::Button());
            this->textBox4 = (gcnew System::Windows::Forms::TextBox());
            this->SuspendLayout();
            // 
            // textBox1
            // 
            this->textBox1->Location = System::Drawing::Point(10, 66);
            this->textBox1->Name = L"textBox1";
            this->textBox1->Size = System::Drawing::Size(76, 20);
            this->textBox1->TabIndex = 0;
            // 
            // textBox2
            // 
            this->textBox2->Location = System::Drawing::Point(125, 66);
            this->textBox2->Name = L"textBox2";
            this->textBox2->Size = System::Drawing::Size(91, 20);
            this->textBox2->TabIndex = 1;
            // 
            // textBox3
            // 
            this->textBox3->Location = System::Drawing::Point(246, 66);
            this->textBox3->Name = L"textBox3";
            this->textBox3->Size = System::Drawing::Size(112, 20);
            this->textBox3->TabIndex = 2;
            // 
            // label1
            // 
            this->label1->AutoSize = true;
            this->label1->Font = (gcnew System::Drawing::Font(L"Comic Sans MS", 12, System::Drawing::FontStyle::Bold, System::Drawing::GraphicsUnit::Point, 
                static_cast<System::Byte>(204)));
            this->label1->Location = System::Drawing::Point(-7, 40);
            this->label1->Name = L"label1";
            this->label1->Size = System::Drawing::Size(122, 23);
            this->label1->TabIndex = 3;
            this->label1->Text = L"Первое число";
            // 
            // label2
            // 
            this->label2->AutoSize = true;
            this->label2->Font = (gcnew System::Drawing::Font(L"Comic Sans MS", 12, System::Drawing::FontStyle::Bold, System::Drawing::GraphicsUnit::Point, 
                static_cast<System::Byte>(204)));
            this->label2->Location = System::Drawing::Point(121, 40);
            this->label2->Name = L"label2";
            this->label2->Size = System::Drawing::Size(117, 23);
            this->label2->TabIndex = 4;
            this->label2->Text = L"Второе число";
            // 
            // label3
            // 
            this->label3->AutoSize = true;
            this->label3->BackColor = System::Drawing::SystemColors::MenuHighlight;
            this->label3->BorderStyle = System::Windows::Forms::BorderStyle::Fixed3D;
            this->label3->Font = (gcnew System::Drawing::Font(L"Comic Sans MS", 12, System::Drawing::FontStyle::Bold, System::Drawing::GraphicsUnit::Point, 
                static_cast<System::Byte>(204)));
            this->label3->Location = System::Drawing::Point(257, 40);
            this->label3->Name = L"label3";
            this->label3->Size = System::Drawing::Size(89, 25);
            this->label3->TabIndex = 5;
            this->label3->Text = L"Результат";
            // 
            // button1
            // 
            this->button1->Location = System::Drawing::Point(12, 102);
            this->button1->Name = L"button1";
            this->button1->Size = System::Drawing::Size(48, 43);
            this->button1->TabIndex = 6;
            this->button1->Text = L"+";
            this->button1->UseVisualStyleBackColor = true;
            this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
            // 
            // button2
            // 
            this->button2->Location = System::Drawing::Point(86, 102);
            this->button2->Name = L"button2";
            this->button2->Size = System::Drawing::Size(46, 42);
            this->button2->TabIndex = 7;
            this->button2->Text = L"-";
            this->button2->UseVisualStyleBackColor = true;
            this->button2->Click += gcnew System::EventHandler(this, &Form1::button2_Click);
            // 
            // button3
            // 
            this->button3->Location = System::Drawing::Point(157, 103);
            this->button3->Name = L"button3";
            this->button3->Size = System::Drawing::Size(47, 42);
            this->button3->TabIndex = 8;
            this->button3->Text = L"*";
            this->button3->UseVisualStyleBackColor = true;
            this->button3->Click += gcnew System::EventHandler(this, &Form1::button3_Click);
            // 
            // button4
            // 
            this->button4->Location = System::Drawing::Point(229, 103);
            this->button4->Name = L"button4";
            this->button4->Size = System::Drawing::Size(45, 42);
            this->button4->TabIndex = 9;
            this->button4->Text = L"/";
            this->button4->UseVisualStyleBackColor = true;
            this->button4->Click += gcnew System::EventHandler(this, &Form1::button4_Click);
            // 
            // button5
            // 
            this->button5->Location = System::Drawing::Point(292, 104);
            this->button5->Name = L"button5";
            this->button5->Size = System::Drawing::Size(48, 41);
            this->button5->TabIndex = 10;
            this->button5->Text = L"^2";
            this->button5->UseVisualStyleBackColor = true;
            this->button5->Click += gcnew System::EventHandler(this, &Form1::button5_Click);
            // 
            // button6
            // 
            this->button6->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 6.75F, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point, 
                static_cast<System::Byte>(204)));
            this->button6->Location = System::Drawing::Point(40, 161);
            this->button6->Name = L"button6";
            this->button6->Size = System::Drawing::Size(50, 43);
            this->button6->TabIndex = 11;
            this->button6->Text = L"memory";
            this->button6->UseVisualStyleBackColor = true;
            this->button6->Click += gcnew System::EventHandler(this, &Form1::button6_Click);
            // 
            // button7
            // 
            this->button7->Location = System::Drawing::Point(188, 160);
            this->button7->Name = L"button7";
            this->button7->Size = System::Drawing::Size(50, 43);
            this->button7->TabIndex = 12;
            this->button7->Text = L"clear";
            this->button7->UseVisualStyleBackColor = true;
            this->button7->Click += gcnew System::EventHandler(this, &Form1::button7_Click);
            // 
            // button8
            // 
            this->button8->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 6.75F, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point, 
                static_cast<System::Byte>(204)));
            this->button8->Location = System::Drawing::Point(115, 161);
            this->button8->Name = L"button8";
            this->button8->Size = System::Drawing::Size(50, 43);
            this->button8->TabIndex = 13;
            this->button8->Text = L"memory+";
            this->button8->UseVisualStyleBackColor = true;
            this->button8->Click += gcnew System::EventHandler(this, &Form1::button8_Click);
            // 
            // button9
            // 
            this->button9->Location = System::Drawing::Point(40, 221);
            this->button9->Name = L"button9";
            this->button9->Size = System::Drawing::Size(50, 43);
            this->button9->TabIndex = 14;
            this->button9->Text = L"=> 1";
            this->button9->UseVisualStyleBackColor = true;
            this->button9->Click += gcnew System::EventHandler(this, &Form1::button9_Click);
            // 
            // button10
            // 
            this->button10->Location = System::Drawing::Point(115, 221);
            this->button10->Name = L"button10";
            this->button10->Size = System::Drawing::Size(50, 43);
            this->button10->TabIndex = 15;
            this->button10->Text = L"=> 2";
            this->button10->UseVisualStyleBackColor = true;
            this->button10->Click += gcnew System::EventHandler(this, &Form1::button10_Click);
            // 
            // textBox4
            // 
            this->textBox4->Location = System::Drawing::Point(323, 12);
            this->textBox4->Name = L"textBox4";
            this->textBox4->Size = System::Drawing::Size(100, 20);
            this->textBox4->TabIndex = 16;
            // 
            // Form1
            // 
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(435, 321);
            this->Controls->Add(this->textBox4);
            this->Controls->Add(this->button10);
            this->Controls->Add(this->button9);
            this->Controls->Add(this->button8);
            this->Controls->Add(this->button7);
            this->Controls->Add(this->button6);
            this->Controls->Add(this->textBox3);
            this->Controls->Add(this->textBox2);
            this->Controls->Add(this->textBox1);
            this->Controls->Add(this->button5);
            this->Controls->Add(this->button4);
            this->Controls->Add(this->button3);
            this->Controls->Add(this->button2);
            this->Controls->Add(this->button1);
            this->Controls->Add(this->label3);
            this->Controls->Add(this->label2);
            this->Controls->Add(this->label1);
            this->Name = L"Form1";
            this->Text = L"Form1";
            this->ResumeLayout(false);
            this->PerformLayout();
 
        }
 
 
///////////////////////////////////////////////////////////////////////////////////////////
#pragma endregion
    bool check(double &x1, double &x2) {
    //конвертируем текст в первом поле в число 
    try{
         x1 = Convert::ToDouble(textBox1->Text);
    }
    catch(...) {
          MessageBox::Show("Неверное значение первого операнда");
        textBox1->Focus();
    }
    //конвертируем текст во втором поле в число 
    try{
           x2 = Convert::ToDouble(textBox2->Text);
    }
    catch(...) {
         MessageBox::Show("Неверное значение второго операнда");
         textBox2->Focus();
    }
    return true;
}
 
 
///////////сложение
private: System::Void 
button1_Click(System::Object^  sender, System::EventArgs^  e) {
  double x1, x2, res;
  if (check(x1,x2)){                 
    res = x1 + x2;
    textBox3->Text = Convert::ToString(res);
  }
}
 
///////////вычитание
private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {
double x1, x2, res;
  if (check(x1,x2)){                 
    res = x1 - x2;
    textBox3->Text = Convert::ToString(res);
  }
}
 
 
////////////умножение       
private: System::Void button3_Click(System::Object^  sender, System::EventArgs^  e) {
             double x1, x2, res;
  if (check(x1,x2)){                 
    res = x1 * x2;
    textBox3->Text = Convert::ToString(res);
  }
}
 
         
 
//////////////деление
private: System::Void button4_Click(System::Object^  sender, System::EventArgs^  e) {
             double x1, x2, res;
  if (check(x1,x2)){
      
      res = x1 / x2;
    textBox3->Text = Convert::ToString(res);
  }
}
 
    
//////////////степень
private: System::Void button5_Click(System::Object^  sender, System::EventArgs^  e) {
 
              double x1, x2, res;
  if (check(x1,x2)){
      
      res = pow(x1,x2);
    textBox3->Text = Convert::ToString(res);
  }
}
 
         
 
 
private: System::Void button6_Click(System::Object^  sender, System::EventArgs^  e) {
            mem= Convert::ToDouble(textBox3->Text);
  }
 
 
    
 
private: System::Void button8_Click(System::Object^  sender, System::EventArgs^  e)
         {
             mem+= Convert::ToDouble(textBox3->Text);
         }
private: System::Void button7_Click(System::Object^  sender, System::EventArgs^  e) {mem=0;
         }
private: System::Void button9_Click(System::Object^  sender, System::EventArgs^  e) {textBox1->Text= Convert::ToString(mem);
         }
private: System::Void button10_Click(System::Object^  sender, System::EventArgs^  e) {textBox2->Text= Convert::ToString(mem);
         }
};
}

private: System::Void button6_Click(System::Object^  sender, System::EventArgs^  e) {
            mem= Convert::ToDouble(textBox3->Text);
  }

textBox1->Text= Convert::ToString(mem)