C++ 基本 使用類別多樣 C++ basic function ,class Polymorphism introduction

 1 //++++++++++++++++++++++++++
 2  //      HelloClass.cpp
 3  //++++++++++++++++++++++++++
 4  
 5  ///#include header
 6  #include <iostream>
 7  #include <string>
 8  
 9  ///Using
10  using namespace std;
11  
12  ///Class Cellphone
13  class Cellphone //function is method , variable is member
14  {
15      ///Public
16      public:
17      string brand = "APPLE";
18      void outlook() { cout << "cool ! \n" ; }
19      void display() { cout << "shine ! \n" ; }
20      
21      ///+
22  }; //end class include semi colon
23  
24  ///Class Smartphone
25  class Smartphone: public Cellphone  // colon : symbol to inherit from a class.
26  {
27      ///Public
28      public:
29      string model = "iPhoneX";
30      void display() { cout << "glitter! \n" ; } //Polymorphism
31      
32      ///+
33  }; //end class include semi colon
34  
35  ///mainentry
36  int main()
37  {
38      ///declare
39      Smartphone myPhone;
40      
41      ///myphone .outlook
42      myPhone.outlook();//inherit from Cellphone.outlook()
43      
44      ///myphone .display
45      myPhone.display();//inherit from Cellphone.display() , Smartphone.display() override former
46      
47      ///print data
48      cout << myPhone.brand + " " + myPhone.model;
49      
50      ///mainend
51      return 0;
52  } //main_end
53  

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