isdigit man page on NetBSD
[printable version]
ISDIGIT(3) BSD Library Functions Manual ISDIGIT(3)
NAME
isdigit — decimal-digit character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
int
isdigit(int c);
DESCRIPTION
The isdigit() function tests for any decimal-digit character.
RETURN VALUES
The isdigit() function returns zero if the character tests false and
returns non-zero if the character tests true.
SEE ALSO
ctype(3), isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(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 isdigit() function conforms to ANSI X3.159-1989 (“ANSI C89”).
CAVEATS
The argument to isdigit() must be EOF or representable as an unsigned
char; otherwise, the behavior is undefined. See the CAVEATS section of
ctype(3) for more details.
BSD April 17, 2008 BSD
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