C++초짜가 질문좀 할게요.

#include <iostream>
using namespace std;
 
class Complexity {
public:
	Complexity ();
	Complexity (int,int);
	Complexity AddTo (Complexity);
	Complexity operator += (Complexity c);
	void print();
private:
	int myReal;
	int myImaginary;
};
Complexity::Complexity()
{
	myReal = 0;
	myImaginary = 0;
}
Complexity :: Complexity(int r,int i)
{
	myReal = r;
	myImaginary = i;
}
Complexity Complexity::AddTo (Complexity c)
{
	myReal += c.myReal;
	myImaginary += c.myImaginary;
	return Complexity (myReal,myImaginary);
}
 
Complexity Complexity::operator+=(Complexity c)
{
	return AddTo(c);
}
void Complexity::print()
{
	cout<<myReal;
	if(myImaginary >=0)
		cout << '+';
	cout<< myImaginary << 'i'<<endl;
}