The use of static member variables and static member functions in C + + classes

Code:

1#include <iostream>2#include <string>3#include <cstdio>4 5 using namespacestd;6 7 classa{8      Public:9         Static intA;Ten         //static int a = 0;//compilation does not pass and cannot be initialized within a class One         intb; A         Static voidfunc1 () { -cout<<"static Func"<<Endl; -a++; the             //b++; -         } -         voidFunc2 () { -cout<<"normal func"<<Endl; +a++; -b++; +         } A }c; at intA::a =0;//compilation can be initialized outside of the class -  - intMainintargcChar*argv[]) { -  - c.func1 (); - C.func2 (); in  -     return 0; to}

Output:

Static Funcnormal func

Analysis:

1. Static member variables cannot be initialized in a class and need to be initialized outside of the class.

2, static member functions can only access static member variables, ordinary member functions do not have this restriction.

3. A static member function cannot be a virtual function.

The use of static member variables and static member functions in C + + classes