In general, array is mutable and linear collection of same data type elements. 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 For example, in the pascal programming language, the declaration type mytable = array [1.4,1.2] of integer, defines a new array data type called mytable Mytable then defines a variable a of that type, which is an aggregate of eight elements, each being an integer variable identified by two indices.
In statically typed languages such as c, c++, java or c#, a variable also has a type, meaning that only certain kinds of values can be stored in it For example, a variable of type integer is prohibited from storing text values [6] in dynamically typed languages such as python, a variable's type is inferred by its value, and can change according to its value In common lisp, both situations. [1] in the language c, the vla is said to have a variably modified data type that depends on a value (see dependent type). Assigning to a variable of reference type simply copies the reference, whereas assigning to a variable of value type copies the value
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.
WATCH
