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Consider printf:
int printf ( const char * format, ... );
What are the terms used to describe the ... and the functions that use it? I've been calling it an ellipsis, but that's like calling & the "ampersand operator."
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Some common synonyms of token are mark, note, sign, and symptom. While all these words mean "a discernible indication of what is not itself directly perceptible," token applies to something that serves as a proof of something intangible.
In general, a token is an object that represents something else, such as another object (either physical or virtual), or an abstract concept as, for example, a gift is sometimes referred to as a token of the giver's esteem for the recipient.
Definition of token (Entry 1 of 2) 1a : a piece resembling a coin issued for use (as for fare on a bus) by a particular group on specified terms. b : a piece resembling a coin issued as money by some person or body other than a de jure government.
A given or granted item of value only to the recipient with no other appreciable economic value. Examples are trophies, certificates or other customized symbols of appreciation, recognition or courtesy; free promotional items such as advertisers' calendars, pens, notepads, etc.
Variable length parameter list
Edit:
Or, if describing the function itself: Variadic function
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