An expression in a programming language is a combination of value (computer science)s, function (programming)s, tokens, Atomic (computer science)s, and procedure (programming)s, that are interpreted ( evaluated ) according to the particular rules of precedence and of association for a particular programming language, which computes and then produces ( returns , in a state (computer science) environment) another value. The expression is said to evaluate to that value. As in mathematics, the expression is (or can be said to have ) its evaluated value; the expression is a representation of that value.

Expressions may or may not have Side-effect (computer science)s.

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