isprint
, isgraph
---printable character predicates#include <ctype.h> int isprint(int c); int isgraph(int c);Description
isprint
is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for printable
characters, and 0 for other character arguments.
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 either macro using `#undef isprint
' or `#undef isgraph
'.
Returns
isprint
returns non-zero if c is a printing character,
(0x20
--0x7E
).
isgraph
behaves identically to isprint
, except that the space
character (0x20
) is excluded.
Portability
isprint
and isgraph
are ANSI C.
No supporting OS subroutines are required.