C++中的多态

 1 #include<iostream>
 2 using namespace std;
 3 
 4 class Complex
 5 {
 6 private:
 7     int real,imag;
 8 public:
 9     void show() const;
10     Complex operator +(const Complex c);
11     Complex operator -(const Complex c);
12     /*
13     Complex(int a=0,int b=0)
14     {
15         real=a;imag=b;
16     }
17     */
18     Complex(int a=0,int b=0):real(a),imag(b)
19     {}
20 };//don‘t forget this!
21 
22 void Complex::show() const
23 {
24     cout<<"real:"<<real<<"imag:"<<imag<<endl;
25 }
26 
27 Complex Complex::operator +(const Complex c)
28 {
29     Complex ret;
30     ret.real=real+c.real;
31     ret.imag=imag+c.imag;
32     return ret;
33 }
34 
35 Complex Complex::operator -(const Complex c)
36 {
37     Complex ret;
38     ret.real=real-c.real;
39     ret.imag=imag-c.imag;
40     return ret;
41 }
42 
43 int main()
44 {
45     Complex a(2,3),b(-1,5),c,d;
46     a.show();
47     b.show();
48     c=a+b;
49     d=a-b;
50     c.show();
51     d.show();
52     return 0;
53 }