prototype

void myfunc( char *somearg, int foo );

C supports "non-strict" prototyping, in which you don't prototype the args, so:

void myfunc( char *somearg, int foo );

void myfunc();

If you try to use a function without prototyping it, and the function isn't earlier in the same source file, then your compiler won't be too happy with you.

Pro"to*type (?), n. [F., from L. prototypus original, primitive, Gr. , ; first + type, model. See Proto-, and Type]

An original or model after which anything is copied; the pattern of anything to be engraved, or otherwise copied, cast, or the like; a primary form; exemplar; archetype.

They will turn their backs on it, like their great precursor and prototype. Burke.

© Webster 1913.