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ISALNUM(3) |
Library Functions Manual |
ISALNUM(3) |
NAME
isalnum — alphanumeric character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
int
isalnum(int c);
DESCRIPTION
The
isalnum() function tests for any character for which
isalpha(3) or
isdigit(3) is true.
RETURN VALUES
The isalnum() function returns zero if the character tests false and returns non-zero if the character tests true.
SEE ALSO
ctype(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)
STANDARDS
The isalnum() function conforms to ANSI X3.159-1989 (“ANSI C89”).
CAVEATS
The argument to
isalnum() must be
EOF or representable as an
unsigned char; otherwise, the behavior is undefined. See the
CAVEATS section of
ctype(3) for more details.