NAME    [Toc]    [Back]

     isdigit, isnumber -- decimal-digit character test

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <ctype.h>

     int
     isdigit(int c);

     int
     isnumber(int c);

DESCRIPTION    [Toc]    [Back]

     The isdigit() function tests for any decimal-digit character.  For any
     locale, this includes the following characters only:

     ``0''	   ``1''	 ``2''	       ``3''	     ``4''
     ``5''	   ``6''	 ``7''	       ``8''	     ``9''

     For single C chars locales (see multibyte(3)) the value of the argument
     is representable as an unsigned char or the value of EOF.

RETURN VALUES    [Toc]    [Back]

     The isdigit() function returns zero if the character tests false and
     returns non-zero if the character tests true.

COMPATIBILITY    [Toc]    [Back]

     Although isdigit() accepts arguments outside of the range of the unsigned
     char type in locales with large character sets, this is a 4.4BSD extension
 and the iswdigit() function should be used instead for maximum
     portability.

SEE ALSO    [Toc]    [Back]

     ctype(3), iswdigit(3), multibyte(3), ascii(7)

STANDARDS    [Toc]    [Back]

     The isdigit() function conforms to ISO/IEC 9899:1990 (``ISO C89'').


FreeBSD 5.2.1			October 6, 2002 		 FreeBSD 5.2.1