The set of all global variables is known as the global environment or global state. Additionally, they permit lazy allocation and initialization, whereas global variables in many languages will always consume resources Data segment in computing, a data segment (often denoted.data) is a portion of an object file or the corresponding address space of a program that contains initialized static variables, that is, global variables and static local variables.
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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.
A second use case would be multiple threads accumulating information into a global variable To avoid a race condition, every access to this global variable would have to be protected by a mutex. A global variable is a variable declared in the main body of the source code, outside all functions, while a local variable is one declared within the body of a function or a block. 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.
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. Singletons are often preferred to global variables because they do not pollute the global namespace (or their containing namespace)
