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 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. Global variable in computer programming, a global variable is a variable with global scope, meaning that it is visible (hence accessible) throughout the program, unless shadowed The set of all global variables is known as the global environment or global state.
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 In many languages, global variables are always static, but in some languages they are dynamic, while local variables are generally automatic, but may be static. Or in simpler terms, a variable is a named container for a particular set of bits or type of data (like integer, float, string, etc.) or undefined [1] a variable can eventually be. See the lexical environment section below)
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. In compiler optimization, register allocation is the process of assigning local automatic variables and expression results to a limited number of processor registers 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.
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