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 and mapping functions
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
int
isalnum(int c);
int
isalpha(int c);
int
isascii(int c);
int
isblank(int c);
int
iscntrl(int c);
int
isdigit(int c);
int
isgraph(int c);
int
islower(int c);
int
isprint(int c);
int
ispunct(int c);
int
isspace(int c);
int
isupper(int c);
int
isxdigit(int c);
int
toascii(int c);
int
tolower(int c);
int
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, with the exception of isascii(), isblank() and
toascii(), conform to ISO/IEC 9899:1990 (“ISO C90”).
BSD October 21, 2006 BSD
