isDIGIT man page on OpenBSD
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ISDIGIT(3) OpenBSD Programmer's Manual ISDIGIT(3)
NAME
isdigit - decimal-digit character test
SYNOPSIS
#include <ctype.h>
int
isdigit(int c);
DESCRIPTION
The isdigit() function tests for any decimal-digit character.
RETURN VALUES
The isdigit() macro returns zero if the character tests false or non-zero
if the character tests true.
SEE ALSO
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 C'').
CAVEATS
The argument to isdigit() must be EOF or representable as an unsigned
char; otherwise, the result is undefined.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9
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