2023.4.18

 1 //例8.1
 2 #include <iostream>
 3 using namespace std;
 4 class Complex
 5 {
 6 public:
 7     Complex(double r = 0.0,double i = 0.0):real(r),image(i){}
 8     Complex operator+(const Complex &c2) const;
 9     Complex operator-(const Complex &c2) const;
10     void display() const;
11 private:
12     double real;
13     double image;
14 };
15 Complex Complex::operator+(const Complex &c2) const
16 {
17     return Complex(real+c2.real,image+c2.image);
18 }
19 Complex Complex::operator-(const Complex &c2) const
20 {
21     return Complex(real-c2.real,image-c2.image);
22 }
23 void Complex::display()const
24 {
25     cout<<"("<<real<<","<<image<<")"<<endl;
26 }
27 int main()
28 {
29     Complex c1(5,4),c2(2,10),c3;
30     cout<<"c1 = ";c1.display();
31     cout<<"c2 = ";c2.display();
32     c3 = c1 -c2;
33     cout<<"c3 = c1 - c2 = ";c3.display();
34     c3 = c1 + c2;
35     cout<<"c3 = c1 + c2 =";c3.display();
36     return 0;
37 }