将运算符+和-重载为 complex 类的成员函数。 #include<iostream.h> class complex //复数类声明 { public: //外部接口 complex(double r=0.0,double i=0.0) //构造函数 {real=r;imag=i;} complex operator + (complex c2); //+重载为成员函数 complex operator - (complex c2); //-重载为成员函数 void display( ); //输出复数 private: //私有数据成员 double real; //复数实部 double imag; //复数虚部 }; 完成该类的实现并编译运行该程序。 20

以下为重载后的代码：

#include<iostream>
using namespace std;

class complex //复数类声明
{
public: //外部接口
    complex(double r = 0.0, double i = 0.0) //构造函数
    {
        real = r;
        imag = i;
    }

    complex operator+(complex c2) //+重载为成员函数
    {
        complex temp;
        temp.real = real + c2.real;
        temp.imag = imag + c2.imag;
        return temp;
    }

    complex operator-(complex c2) //-重载为成员函数
    {
        complex temp;
        temp.real = real - c2.real;
        temp.imag = imag - c2.imag;
        return temp;
    }

    void display() //输出复数
    {
        cout << "(" << real << "," << imag << ")" << endl;
    }

private: //私有数据成员
    double real; //复数实部
    double imag; //复数虚部
};

int main()
{
    complex c1(1, 2);
    complex c2(3, 4);
    complex c3 = c1 + c2;
    complex c4 = c1 - c2;
    c3.display();
    c4.display();
    return 0;
}

输出结果为：

(4,6)
(-2,-2)