第八周一（2）友元

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原创最新推荐文章于 2026-07-26 15:50:19 发布 693 阅读 AI 写同款· GEO 优化 ›

C++系列学习05 本文介绍了C++面向对象编程中的继承特性和运算符重载。主要内容包括：1. this指针的概念和使用场景；2. 运算符重载规则及实际应用（输出/输入/赋值运算符）；3. 继承的三种方式及继承中的构造/析构函数调用顺序；4. 多继承中的同名成员处理及菱形继承问题；5. 虚拟继承的实现原理（虚基类指针和虚基类表）。通过代码示例详细演示了这些特性的具体应用，帮助理解C++面向对象编程的核心概念。阅读详情

#include <iostream>

using namespace std;

class Complex
{public:
	Complex(){real=0;imag=0;}
	Complex(double r,double i){real=r;imag=i;}
	friend Complex operator+(Complex &c1,Complex &c2);
	friend Complex operator-(Complex &c1,Complex &c2);
	friend Complex operator*(Complex &c1,Complex &c2);
	friend Complex operator/(Complex &c1,Complex &c2);
	void display();
 private:
	double real;
	double imag;
};
//下面定义友元函数
 Complex operator+(Complex &c1,Complex &c2)
 {
 return Complex(c1.real+c2.real,c1.imag+c2.imag);
 }
 Complex operator-(Complex &c1,Complex &c2)
 {
 return Complex(c1.real-c2.real,c1.imag-c2.imag);
 }
 Complex operator*(Complex &c1,Complex &c2)
 {
 return Complex(c1.real*c2.real,c1.imag*c2.imag);
 }
 Complex operator/(Complex &c1,Complex &c2)
 {
 return Complex(c1.real/c2.real,c1.imag/c2.imag);
 }
void Complex::  display()
{
cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
//下面是测试函数
int main()
{
	Complex c1(3,4),c2(5,-10),c3;
	cout<<"c1=";
	c1.display();
	cout<<"c2=";
	c2.display();
	c3=c1+c2;
	cout<<"c1+c2=";
	c3.display();
	c3=c1-c2;
	cout<<"c1-c2=";
	c3.display();
	c3=c1*c2;
	cout<<"c1*c2=";
	c3.display();
	c3=c1/c2;
	cout<<"c1/c2=";
	c3.display();
	return 0;
}

运行结果：