CTYPE(3) BSD Library Functions Manual CTYPE(3)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 inte‐
ger c. They are available as macros, defined in the include file
⟨ctype.h⟩, or as true functions in the C library. See the specific man‐
ual pages for more information.
SEE ALSOisalnum(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”).
BSD June 4, 1993 BSD