C++重载的相关问题

Question

一、完成复数类CComplex的定义，(包括real和image两个double型数据成员)
●包括构造函数，print()打印数据成员值的成员函数.
● 并用成员函数重载 ‘=’赋值运算符和前、后‘++’运算符，用友元函数重载双目‘+’和‘-’运算符.
二、在主函数中分别进行以下测试 ：
●对象=对象+对象；
●对象=对象-对象；
●++对象；
并分别调用print函数打印对象数据成员值

Answer 1

代码如下：

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
using namespace std;
class CComplex
{
private:
    double real, image;
public:
    CComplex(double r = 0, double i = 0) { real = r; image = i; }
    ~CComplex() {}
    

    //友元函数+
    friend CComplex& operator +(CComplex& c1, CComplex& c2)
    {
        CComplex t;
        t.real = c1.real + c2.real;
        t.image= c1.image + c2.image;
        return t;
    }
    friend CComplex& operator -(CComplex& c1, CComplex& c2)
    {
        CComplex t;
        t.real = c1.real - c2.real;
        t.image = c1.image - c2.image;
        return t;
    }

    //成员函数=
    CComplex& operator =(CComplex& c)
    {
        CComplex t;
        t.real = c.image;
        t.image = c.image;
    }

    //前置++
    CComplex operator ++() {
        this->real += 1;
        this->image += 1;
        return *this;
    }
    //后置++
    CComplex operator ++(int) {

        CComplex c(this->real, this->image);
        this->real += 1;
        this->image += 1;
        return c;
    }
    //前置--
    CComplex operator --() {
        this->real -= 1;
        this->image -= 1;
        return *this;
    }
    //后置--
    CComplex operator --(int) {

        CComplex c(this->real, this->image);
        this->real -= 1;
        this->image -= 1;
        return c;
    }

    void print()
    {
        if (image > 0)
            cout << real << "+" << image << "i";
        else if (image == 0)
            cout << real;
        else
            cout << real << image << "i";
    }

};




int main()
{
    CComplex a(3, 5), b(5, 3);
    cout << "a: ";
    a.print();
    cout << endl << "b: ";
    b.print();
    cout << endl << "a+b= ";
    CComplex c = a + b;
    c.print();
    cout << endl << "a-b= ";
    CComplex d = a - b;
    d.print();

    cout << endl << "++a : ";
    ++a;
    a.print();


    
    return 0;
}