C++中运算符重载的方法

**#include
using namespace std;
class Complex{
public:
    Complex(){real=0;imag=0;}
    Complex(double r,double i){real=r;imag=i;}
    Complex operator + (Complex &c2);   //声明一个运算符重载+的函数
    void display();
private:
    double real;
    double imag;

};
Complex Complex::operator + (Complex &c2) {   //定义运算符+的函数
    Complex c;
    c.real=real+c2.real;
    c.imag=imag+c2.imag;
    return c;
}
void Complex::display() {
    cout<<"("<","<"i)"<int main()
{
    Complex c1(3,4),c2(5,-10),c3;
    c3=c1+c2;
    cout<<"c1=";
    c1.display();
    cout<<"c2=";
    c2.display();
    cout<<"c1+c2=";
    c3.display();
    return 0;


}

**

在进行运算的时候c2为实参调用c1的运算重载函数operator + (Complex &c2),进行求值，得到两个复数之和，注意上面的operator +是一个函数名，它是Complex的成员函数。