ispunct---punctuation character predicate#include <ctype.h> int ispunct(int c);Description
ispunct is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for printable
punctuation characters, and 0 for other characters. It is defined
only when isascii(c) is true or c is EOF.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using `#undef ispunct'.
Returns
ispunct returns non-zero if c is a printable punctuation character
(isgraph(c) && !isalnum(c)).
Portability
ispunct is ANSI C.
No supporting OS subroutines are required.