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Values of type void cannot be used, so the value of such an expression is always thrown away.
==Side effects and elimination==
In many programming languages a function, and hence an expression containing a function, may have [[Side effect (computer science)|side effects]]. An expression with side effects does not normally have the property of [[referential transparency (computer science)|referential transparency]]. In many languages (e.g. C++), expressions may be ended with a semicolon (<code>;</code>) to turn the expression into an expression [[Statement (programming)|statement]]. This asks the implementation to evaluate the expression for its side-effects only and to disregard the result of the expression (e.g. "x+1;") unless it is a part of an expression statement that induces side-effects (e.g. "y=x+1;" or "func1(func2());").
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