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