What is "const"

a. 1 (label en programming of a variable) Whose value cannot be changed directly. 2 (label en programming of a function) Which cannot change the value of its class’s (l/en attribute attributes). n. (label en programming) A (l/en: variable) whose value cannot be changed directly.

In the C, C++, D, and JavaScript programming languages, const is a type qualifier: a keyword applied to a data type that indicates that the data is constant (does not vary). While this can be used to declare constants, const in the C family of languages differs from similar constructs in other languages in being part of the type, and thus has complicated behavior when combined with pointers, references, composite data types, and type-checking.