Differences between static variables (internal and external) and global variables

	external static variables	internal static variables	global variables
Scope	It is valid only when its source file is defined.ProgramOther source files cannot be used.	Local source file (defined{}Valid)	The default value is the source file. If other files need to be used, useExternStatement
Life Cycle	From definition to program completion	From definition to program completion	From definition to program completion
Initialization	Automatically assigned0	Automatically assigned0	Automatically assigned0

Note:

1) InIncludeWhen using the header file, you only needCodePut it in the referenced file. At the same time,One method of a class has only one memory., AndJava.

2) All not addedStaticBoth global variables and functions with a prefix haveGlobal visibilityOther source files can also be accessed.StaticOther source filesHide.