运算符的重载（复数的加减）

#include<cstdio>
#include<cstring>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;

class Complex
{
public:
Complex(double r=0.0,double i=0.0):real(r),imag(i) {}//构造函数
Complex operator + (const Complex &c2)const;//运算符+重载成员函数
Complex operator - (const Complex &c2)const;//运算符-重载成员函数
void display()const;                        //输出复数
private:                                        //私有数据成员
double real;                                //复数实部
double imag;                                //复数虚部
};

Complex Complex::operator+(const Complex&c2)const//重载运算符函数实现
{
return Complex(real+c2.real,imag+c2.imag);//创建一个临时无名对象作为返回值
}

Complex Complex::operator-(const Complex&c2)const
{
return Complex(real-c2.real,imag-c2.imag);
}

void Complex::display()const
{
cout<<"("<<real<<","<<imag<<")"<<endl;
}

int main()
{
Complex c1(5,4),c2(2,10),c3;
cout<<"c1:";
c1.display();
cout<<"c2:";
c2.display();
c3=c1-c2;
cout<<"c3=c1-c2=";
c3.display();
c3=c1+c2;
cout<<"c3=c1+C2=";
c3.display();
return 0;
}