NAME    [Toc]    [Back]

     isdigit - decimal-digit character test

SYNOPSIS    [Toc]    [Back]

     #include <ctype.h>

     int
     isdigit(int c);

DESCRIPTION    [Toc]    [Back]

     The isdigit() function tests for any  decimal-digit  character.

RETURN VALUES    [Toc]    [Back]

     The  isdigit()  macro  returns  zero  if the character tests
false or non-zero
     if the character tests true.

SEE ALSO    [Toc]    [Back]

     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    [Toc]    [Back]

     The isdigit() function conforms to ANSI X3.159-1989  (``ANSI
C'').

CAVEATS    [Toc]    [Back]

     The argument to isdigit() must be EOF or representable as an
unsigned
     char; otherwise, the result is undefined.

OpenBSD     3.6                           June      29,      1991