The set of all global variables is known as the global environment or global state. Debug symbols typically include not only the name of a function or global variable, but also the name of the source code file in which the symbol occurs, as well as the line number at which it is defined Scope (computer science) in computer programming, the scope of a name binding (an association of a name to an entity, such as a variable) is the part of a program where the name binding is valid
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That is, where the name can be used to refer to the entity.
The scope of a variable describes where in a program's text the variable may be used, while the extent (also called lifetime) of a variable describes when in a program's execution the variable has a (meaningful) value
The scope of a variable affects its extent The scope of a variable is actually a property of the name of the variable, and the extent is a property of the storage location of. Variable shadowing in computer programming, variable shadowing occurs when a variable declared within a certain scope (decision block, method, or inner class) has the same name as a variable declared in an outer scope At the level of identifiers (names, rather than variables), this is known as name masking.
While the term can refer to global variables, it is primarily used in the context of nested and anonymous functions where some variables can be in neither the local nor the global scope. The scope resolution operator helps to identify and specify the context to which an identifier refers, particularly by specifying a namespace or class The specific uses vary across different programming languages with the notions of scoping.
