9 Statements [stmt.stmt]

9.2 Expression statement [stmt.expr]

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Expression statements have the form
expression-statement:
	expression ;
The expression is a discarded-value expression (Clause [expr]).
All side effects from an expression statement are completed before the next statement is executed.
An expression statement with the expression missing is called a null statement.
[ Note
:
Most statements are expression statements — usually assignments or function calls.
A null statement is useful to carry a label just before the } of a compound statement and to supply a null body to an iteration statement such as a while statement ([stmt.while]).
— end note
 ]