The set of all global variables is known as the global environment or global state. 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 A global variable, or one with indefinite scope, may be referred to anywhere in the program
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Extent, on the other hand, is a runtime (dynamic) aspect of a variable.
Singletons are often preferred to global variables because they do not pollute the global namespace (or their containing namespace)
Additionally, they permit lazy allocation and initialization, whereas global variables in many languages will always consume resources [1][3] the singleton pattern can also be used as a basis for other design patterns, such as the abstract factory, factory. Hungarian notation is an identifier naming convention in computer programming in which the name of a variable or function indicates its intention or kind, or in some dialects, its type The original hungarian notation uses only intention or kind in its naming convention and is sometimes called apps hungarian as it became popular in the microsoft apps division in the development of microsoft.
External variable in the c programming language, and its predecessor b, an external variable is a variable defined outside any function block On the other hand, a local (automatic) variable is a variable defined inside a function block. While the use of global variables is generally discouraged in modern programming, some older operating systems such as unix were originally designed for uniprocessor hardware and often use global variables to store important values An example is the errno used by many functions of the c library
On a modern machine, where multiple threads may be modifying the errno variable, a call of a.
