Summary of C++ review key points: Five static member variables and member functions

Thinking: Each variable has attributes. Are there some properties that are owned by all objects?

1. Static member variables

1) Define static member variables

Ø The keyword static can be used to describe members of a class,

static members Provides a sharing mechanism for similar objects

Ø When a member of a class is specified as static, no matter how many objects of this class are created, these objects share this static member

Ø Static members Belongs to a class, it is not an object member

2. Static member function

1) Concept

Ø The number of static member functions is preceded by key Word static

Ø Static member function provides common operations that do not depend on the class data structure. It does not have this pointer

Ø When calling a static member function outside the class, use "class name::" as a qualification word, or calling through an object

# Difficult question: Ordinary variables cannot be used in static member functions.

//Static member variables belong to the entire class. It is not clear whether they are attributes of that specific object.

Summary: static modified member variables belong to the class itself, ordinary member variables belong to objects, and there will be as many corresponding member variables as there are objects; static members Variables are shared.

The function modified by static belongs to the class itself, and static functions cannot access non-static variables! Static functions can be accessed through objects or through class names.

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