运算符重载一个@运算,所有的运算符号都可以重载

操作符重载写在全局 

#define _CRT_SECURE_NO_WARNINGS#include<iostream>using namespace std;class Complex {public:Complex(int a, int b) {this->a = a;this->b = b;}void printComplex() {cout << "(" << this->a << "," << this->b << ")" << endl;}friend Complex &operator+=(Complex &c1, Complex &c2);private:int a;int b;};//操作符重载写在全局Complex &operator+=(Complex &c1, Complex&c2) {c1.a += c2.a;c1.b += c2.b;return c1;}int main() {Complex c1(1, 2);Complex c2(2, 4);(c1 += c2) += c2;c1.printComplex();c2.printComplex();return 0;}

+=重载写在类内 

#define _CRT_SECURE_NO_WARNINGS#include<iostream>using namespace std;class Complex {public:Complex(int a, int b) {this->a = a;this->b = b;}void printComplex() {cout << "(" << this->a << "," << this->b << ")" << endl;}Complex &operator+=(Complex &another) {this->a += another.a;this->b += another.b;return *this; }private:int a;int b;};int main() {Complex c1(1, 2);Complex c2(2, 4);(c1 += c2) += c2;//c1.operator+=(c2) .operator(c2)c1.printComplex();c2.printComplex();return 0;}