Full prototype:
int ispunct(int);
Purpose and Notes:
Tests whether the argument passed into the function is a punctuation character (or any non space or alphanumerical character if "C" is the set locale) according to the set locale.
Returns:
int- C-style true if the argument passed into the function is a punctuation character, or a C-style false otherwise.
Argument 1:
int- A character (including the EOF character, hence int instead of char) to be tested on whether it is a punctuation character according to the set locale.