CTYPE(3)

NAME
isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph, iscntrl, isascii, toupper, tolower, toascii - character classification macros

SYNOPSIS
#include <ctype.h>
int c
isalpha(c);
isupper(c);
islower(c);
isdigit(c);
isxdigit(c);
isalnum(c);
isspace(c);
ispunct(c);
isprint(c);
isgraph(c);
iscntrl(c);
isascii(c);
toupper(c);
tolower(c);
toascii(c);

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

See the specific manual pages for more information.

SEE ALSO
isalpha(3), isupper(3), islower(3), isdigit(3), isxdigit(3), isalnum(3), isspace(3), ispunct(3), isprint(3), isgraph(3), iscntrl(3), isascii(3), toupper(3), tolower(3), toascii(3), ascii(7)

STANDARDS
These functions, except for toupper(), tolower() and toascii(), conform to ansiC.