in Python, variable lookup follows the LGB principle of prioritizing a variable in a local scope (regional scope), failing to find it in the global scope, and finally attempting to build the scope again (build-in Scope), and throws an exception if
All variables in C language have their own scopes. The types of declarative variables are different, and their scopes are also different. Variables in C language can be divided into local variables and global variables according to the scope.I.
1, can local variables and global variable duplicate?
A: Yes, the local will screen the overall situation. To use a global variable, you need to use the "::"
Local variables can have the same name as global variables, and when referenced within a
By reading the "JS Advanced Program Design" This book, the scope of JS and the scope of the chain knowledge has a preliminary understanding and understanding, ready to take notes for your reference, notes in more words, but personally think the
Original blog, reprint please indicate the source--Zhou Xuewei http://www.cnblogs.com/zxouxuewei/Static is used in two ways: static in process-oriented programming and static in object-oriented programming. The former applies to ordinary variables
http://www.cnblogs.com/wolf-lifeng/p/3156936.html2.3 Global Scope 2.3.1 OverviewThe global scope is the largest namespace scope, unlike the user-defined namespace scope, where the global scope does not need to be defined, and it naturally exists in
C ++ Primer study note _ 23 _ class and data abstraction (9) -- four object lifetime and scope, static usage summary, primer_23
C ++ Primer study note _ 23 _ class and data abstraction (9) -- four object lifetime and scope, static usage
Scope global variable local variable static variable external variable constant volatile variable
Scope:The scope rule tells us the valid range of a variable, where it is created, and where it
Global variablesScope: Global scope (global variables can be used for all source files only if they are defined in one source file.) )Life cycle: Program run time is always presentReference method: The global variable to be referenced must be
Using the static modifier to declare static members that belong to the type itself, rather than to a particular object, can be used for classes, fields, methods, properties, operators, events, and constructors, but not for indexers, destructors, or
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