NAME
isalnum, isalpha,
isascii, isblank,
iscntrl, isdigit,
isgraph, islower,
isprint, ispunct,
isspace, isupper,
isxdigit, toascii
tolower, toupper, —
character classification
macros
SYNOPSIS
#include <ctype.h>
int c
isalnum(int
c);
isalpha(int
c);
isascii(int
c);
iscntrl(int
c);
isdigit(int
c);
isgraph(int
c);
islower(int
c);
isprint(int
c);
ispunct(int
c);
isspace(int
c);
isupper(int
c);
isxdigit(int
c);
toascii(int
c);
tolower(int
c);
toupper(int
c);
DESCRIPTION
The above functions perform character tests and conversions on the integer c. They are available as macros, defined in the include file ⟨ctype.h⟩, or as true functions in the C library. See the specific manual pages for more information.SEE ALSO
isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), toascii(3), tolower(3), toupper(3), ascii(7)
STANDARDS
These functions, except for isblank(),
toupper(), tolower() and
toascii(), conform to ANSI
X3.159-1989 (“ANSI C89”).