C++的类和标头

我正在尝试学习如何在c ++中使用类函数。我有我在这里写的代码，但有些问题。我知道你不做功课。但是，如果您能帮助我学习它，而无需使用诸如您看这里之类的东西..我做过研究..谷歌CPLUPLUS网站..但是有些东西我没有得到，所以希望你能帮助我。我正在使用开发C++。

代码取两个数字，然后根据选择的使用来计算它们。加。。减去。。乘。。和设计

这是我的第一个错误代码

30  23  C:UsersddempseyDesktopclassaddSubtractMain.cpp [Error] no matching function for call to 'addSubtract::initialize()'

这是我的标题代码

#ifndef CLASS_addSubtract_h
#define CLASS_addSubtract_h
class addSubtract
{
    private:
       int one;
       int two;

    public:
        int add ();
        int sub ();
        int multi ();
        int devide ();
        void initialize (int n1, int n2);
};

.class

using namespace std;
#include "addSubtract.h"

void addSubtract::initialize(int n1, int n2)
{
    one = n1;
    two = n2;
}
int addSubtract::add()
{
   return(one + two);
}
int addSubtract::sub()
{
   return(one - two);
}
int addSubtract::multi()
{
   return(one * two);
}
int addSubtract::devide()
{
   return(one / two);
}
//class function code

主要

#include "addSubtract.h"
#include <iostream>
#include <fstream>
#include <string.h>
#include <stdio.h>
using namespace std;
int main(void)
{
    addSubtract numbers; //instantiate an object
    int n1;
    int n2;
    char choice;
    cout<<"Enter first number to calculate  ";
    cin>>n1;
    cout<<"n";
    cout<<"Enter second number to calculate  ";
    cin>>n2;
    cout<<"n";
    cout<<"what would you like to don ";
    cout<<" add enter      (+)n ";
    cout<<" subtract enter (-)n ";
    cout<<" multiply enter (*)n ";
    cout<<" devide enter   (/)n ";
    cin>>choice;
        switch (choice)
        {
            case '+' :
            numbers.initialize(int1, int2); 
            cout<<n1<<" + "<<n2<<" ="<<numbers.add()<<endl;
            break;
            case '-' :
            numbers.initialize(int1, int2); 
            cout<<n1<<" - "<<n2<<" = "<<numbers.sub()<<endl;
            break;
            case '*' :
            numbers.initialize(int1, int2); 
            cout<<n1<<" * "<<n2<<" = "<<numbers.multi()<<endl;
            break;
            case '/' :
            numbers.initialize(int1, int2); 
            cout<<n1<<" / "<<n2<<" = "<<numbers.devide()<<endl;
            break;  
            default:
            cout<<"invalid choice" <<endl;          
        }

system("PAUSE");    
return 0;
}