2023.4.18

//例8.1
#include <iostream>
using namespace std;
class Complex
{
public:
    Complex(double r = 0.0,double i = 0.0):real(r),image(i){}
    Complex operator+(const Complex &c2) const;
    Complex operator-(const Complex &c2) const;
    void display() const;
private:
    double real;
    double image;
};
Complex Complex::operator+(const Complex &c2) const
{
    return Complex(real+c2.real,image+c2.image);
}
Complex Complex::operator-(const Complex &c2) const
{
    return Complex(real-c2.real,image-c2.image);
}
void Complex::display()const
{
    cout<<"("<<real<<","<<image<<")"<<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;
}