isdigit(3) - NetBSD Manual Pages

ISDIGIT(3)              NetBSD 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.

NetBSD 9.3                      April 17, 2008                      NetBSD 9.3