The set of all global variables is known as the global environment or global state. In computer science, a local variable is a variable that is given local scope A local variable reference in the function or block in which it is declared overrides the same variable name in the larger scope In programming languages with only two levels of visibility, local variables are contrasted with global variables Each local variable in a function comes into existence only when the function is called, and disappears when the function is exited Such variables are known as automatic variables
These are variables that are external to a function and can be accessed by name by any function. 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. 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. Variable lifetime is contrasted with scope (where a variable can be used) Global and local refer to scope, not lifetime, but scope often implies lifetime
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. 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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