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=== Nullary === A [[constant (mathematics)|constant]] can be treated as the output of an operation of arity 0, called a ''nullary operation''. Also, outside of [[functional programming]], a function without arguments can be meaningful and not necessarily constant (due to [[side effect (computer science)|side effect]]s). Such functions may have some ''hidden input'', such as [[global variable]]s or the whole state of the system (time, free memory, etc.).
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