About the various Members in the class

1   Class  Student  2   {  3   Public  :  4       /*  ******************** *****  */  5 Student (); //  Default constructor. If a constructor with parameters is defined, the default constructor will be overwritten and must be manually defined. Otherwise, the constructor cannot be called.  6 ~ Student (); //  Destructor  7       /*  Destructor, automatically executed at the end of the object's lifetime  8   1. Execute the destructor of a local object in the out-of-scope.  9   2. Static local object:ProgramExecute at execution end or exit  10   3. Global Object: executed at the end of program execution or exit  11       */  12       13 Student (Int ID, Char * Name, Int S, group G): Sex (s), group (g ); //  Member initialization Constructor  14           15 Student ( Const Student & sother ); //  Copy constructor  16       17 Student ( Int ID ); // Conversion constructor: Convert int to student  18       19       Operator   Int (); //  Type conversion function, which converts student to int  20       21       //  If conversion constructor and type conversion function exist at the same time, there may be ambiguity, such:  22       23 Student Operator + ( Const Student & S1 );//  + Operator Overloading  24       25 Student Operator = ( Const Student & S1 ); //  Value assignment operator overload  26       27 Friend ostream Operator <(Ostream & output, Const Student & S1 ); //  Youyuan function, heavy stream insertion operator < 28       29 Friend istream Operator >>( Istream & input, Const Student & S1 ); //  Youyuan function, heavy stream extraction operator>  30       31       Void Display () Const ; //  A common member function cannot modify data members in a class.  32       33       Static  Void Test (); //  A static member function cannot access non-static members. It belongs to the entire class.  34       35 Inline Void TT (); //  Inline built-in functions. The system automatically declares the member functions defined within the class as built-in functions.  36       37       /*  ******************** *****  */  38   Private :  39       /*  ******************** *****  */  40       Int  Sid;  41       Char Sname [ 20  ];  42       Char * Pname; //  Pointer, You need to allocate memory to it in the constructor 43       Static   Int Age; //  Static data member, which belongs to the entire class and is initialized outside the class  44       45       /*  * ******************* Constant members and sub-objects **************** ***************  */  46       //  You can only initialize a member through the member initialization list.  47       //  Define the object execution sequence: 48       //  1. allocate memory  49       //  2. initialize the member list  50       //  3. Execute the constructor  51       Const   Int Sex; //  Constant data member, initialized upon definition  52 Group group; // Sub-Object  53       /*  * ******************* Constant members and sub-objects **************** ***************  */  54       /*  ******************** *****  */  55 }