4-1 复数类的运算符重载

Problem Description

通过本题目的练习可以掌握成员运算符重载及友元运算符重载
要求定义一个复数类，重载加法和减法运算符以适应对复数运算的要求，重载插入运算符(<<)以方便输出一个复数的要求。
Input

要求在主函数中创建对象时初始化对象的值。
Output

输出数据共有4行，分别代表a，b的值和它们求和、求差后的值
Example Input

无
Example Output

a=3.2+4.5i
b=8.9+5.6i
a+b=12.1+10.1i
a-b=-5.7-1.1i

#include<cstdio>#include<iostream>using namespace std;class Point{private:    double real, image;public:    Point()    {        real = 0;        image = 0;    }    Point(double r, double i)    {        real = r;        image = i;    }    Point OP_ADD(Point &c2)    {        Point C;        C.real = real + c2.real;        C.image = image + c2.image;        return C;    }    Point OP_DEL(Point &c3)    {        Point D;        D.real = real - c3.real;        D.image = image - c3.image;        return D;    }    void display1()    {        cout << real << "+" << image << "i" << endl;    }    void display2()    {        cout << real << image << "i" << endl;    }};int main(){    Point c1(3.2, 4.5), c2(8.9, 5.6), c3, c4;    c3 = c1.OP_ADD(c2);    c4 = c1.OP_DEL(c2);    cout << "a=";    c1.display1();    cout << "b=";    c2.display1();    cout << "a+b=";    c3.display1();    cout << "a-b=";    c4.display2();}