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CTYPE(3) Library Functions Manual CTYPE(3)

ctypecharacter classification macros

#include <ctype.h>

int
isalpha(int c);

int
isupper(int c);

int
islower(int c);

int
isdigit(int c);

int
isxdigit(int c);

int
isalnum(int c);

int
isspace(int c);

int
ispunct(int c);

int
isprint(int c);

int
isgraph(int c);

int
iscntrl(int c);

int
isblank(int c);

int
isascii(int c);

int
toupper(int c);

int
tolower(int c);

int
toascii(int c);

The above macros perform character tests and conversions on the integer c.

See each function's own manual page for more information.

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), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

These functions, with the exception of isblank() and toascii(), conform to ANSI X3.159-1989 (“ANSI C89”).

The functions isalpha(), isupper(), islower(), isdigit(), isalnum(), isspace(), ispunct(), isprint(), iscntrl(), and isascii() first appeared in Version 7 AT&T UNIX.

July 17, 2013 OpenBSD-5.6