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For example, <code>2+3</code> is an arithmetic and programming expression which evaluates to 5. A variable is an expression because it denotes a value in memory, so <code>y+6</code> is an expression. An example of a relational expression is <code>4≠4</code>, which evaluates to false.<ref>[https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Expressions Javascript expressions, Mozilla] Accessed July 6, 2009</ref><ref>[https://www.cs.drexel.edu/~rweaver/COURSES/ISTC-2/TOPICS/expr.html Programming in C] Accessed July 6, 2009</ref>
==Void as a result type==
In [[C (programming language)|C]] and most C-derived languages, a call to a function with a [[Void type|void]] return type is a valid expression, of type void.<ref>
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