运算符重载问题!请教
#include <iostream>
using namespace std;
class Complex
{
public:
Complex(){real=0;imag=0;}
Complex(double r,double i){real=r;imag=i;}
Complex operator+(Complex &c2);
void display();
private:
double real;
double imag;
};
Complex Complex::operator+(Complex &c2)
{
Complex c;
c.real=real+c2.real;
c.imag=imag+c2.imag;
return c;
}
void Complex::display()
{
cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
int main()
{
Complex c1(3,4),c2(5,-10),c3;
c3=c1+c2;//=号运算符为什么不需要重载就能够达到目的
cout<<"c1=";
c1.display();
cout<<"c2=";
c2.display();
cout<<"c1+c2=";
c3.display();
return 0;
}
=号运算符为什么不需要重载就能够达到赋值目的,没有想明白,望指教