C++ 运算符重载

运算符重载通过定义函数实现的。 其实质为函数的重载。

#include <iostream>
class Complex
{
public:
    Complex();
    Complex(double r,double i);
    friend Complex operator + (Complex &c,Complex &d);
    void print();
private:
    double real;
    double imag;
};
Complex::Complex()
{
    real = 0;
    imag = 0;
}

Complex::Complex(double r, double i)
{
    real =r;
    imag =i;
}

Complex operator+(Complex &c,Complex &d) //不是：：
{
    return Complex(c.real+d.real,c.imag+d.imag);
}

void Complex::print()
{
    std::cout<<"("<<real<<","<<imag<<"i)\n";
}

int main()
{
    Complex c1(3,4),c2(5,-10),c3;
    c3 = c1+c2;
    std::cout<<"c1=";
    c1.print();

    std::cout<<"c2=";
    c2.print();

    std::cout<<"c1+c2=";
    c3.print();
    return 0;
}