C++运算符重载学习笔记

#include<iostream> using namespace std; class Complex1 { private: int a, b; public: Complex1(Complex1 &obj){ this->a = obj.getA(); this->b = obj.getB(); cout << "我是copy 构造函数" << "a:" << a << "\t b:" << b << endl; } Complex1(int a = 0, int b = 0) { this->a = a; this->b = b; } int getA(){ return a; } int getB(){ return b; } void show(){ cout << "a:" << a << "\t b:" << b << endl; } friend Complex1 operator+(Complex1 &c1, Complex1 &c2); friend Complex1 operator++(Complex1 &c1); Complex1 operator-(Complex1 &c1) { Complex1 tmp; tmp.a = this->a - c1.a; tmp.b = this->b - c1.b; return tmp; } Complex1 operator --(){ this->a--; this->b--; return *this; } //全局函数 后置 ++ friend Complex1 operator++(Complex1 &c2, int); }; //全局函数后置++ Complex1 operator ++ (Complex1 &c2, int) { //先使用C2 的属性，然后让属性++ Complex1 tmp; tmp = c2; c2.a++; c2.b++; return tmp; } //Complex1 ComAdd(Complex1 &c1, Complex1 &c2) //{ // Complex1 tmp; // tmp.a = c1.a + c2.a; // tmp.b = c1.b + c2.b; // return tmp; //} Complex1 operator+(Complex1 &c1, Complex1 &c2) { Complex1 tmp; tmp.a = c1.a + c2.a; tmp.b = c1.b + c2.b; return tmp; } Complex1 operator ++(Complex1 &c1) { c1.a++; c1.b++; return c1; } //void mainhanshu() //{ // Complex1 c1(1, 2), c2(2, 3); // Complex1 c3 = ComAdd(c1, c2); // c3.show(); // system("pause"); //} Complex1 g(){ Complex1 c1; return c1; } void main(){ Complex1 c1(10, 20), c2(3, 4); //+ 运算符有两个参数 左操作数 和 右操作数 // Complex1 c3 = c1.operator-(c2); c3.show(); //目标 通过类的成员函数，完成操作符重载 //1 要承认操作符重载是一个函数，要写函数原型 //2 写出函数条用语言 c1.operator-(c2) //3 完善函数原型 c3++; c3.show(); c3--; c3.show(); c3.operator--(); c3.show(); --c3; c3.show(); //检查后置++ Complex1 c4 = c3++; c4.show(); c3.show(); system("pause"); }