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1. Global static variables
. a life cycle: the entire program
. b Scope: The current file
. c Initialization: uninitialized -> automatically initialized to 0
2. Local static variables
. a life cycle: the entire program
. b scope: the current code segment
. c Initialization: Uninitialized -> automatically initialized to 0 (only once)
3. Static ordinary function
Scope: Current file -> file with the same name does not conflict with other functions
4. Static class members
. A do not belong: Sharing -> belongs to the class, all the shared data objects, this pointer is not
b call: all members of the class
The class static function
. a case of do: Sharing -> only belong to the class, all objects in shared data, no this pointer
b calls: only call static class members.
c access method: static class name :: function name.
