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Linux 2.6 - man page for isdigit (linux section 3posix)

ISDIGIT(P)			    POSIX Programmer's Manual			       ISDIGIT(P)

NAME
       isdigit - test for a decimal digit

SYNOPSIS
       #include <ctype.h>

       int isdigit(int c);

DESCRIPTION
       The isdigit() function shall test whether c is a character of class digit in the program's
       current locale; see the	Base  Definitions  volume  of  IEEE Std 1003.1-2001,  Chapter  7,
       Locale.

       The  c  argument is an int, the value of which the application shall ensure is a character
       representable as an unsigned char or equal to the value of the macro EOF. If the  argument
       has any other value, the behavior is undefined.

RETURN VALUE
       The  isdigit() function shall return non-zero if c is a decimal digit; otherwise, it shall
       return 0.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       To ensure applications portability, especially across natural languages, only  this  func-
       tion and those listed in the SEE ALSO section should be used for character classification.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       isalnum()  ,  isalpha() , iscntrl() , isgraph() , islower() , isprint() , ispunct() , iss-
       pace() , isupper() , isxdigit() , the Base  Definitions	volume	of  IEEE Std 1003.1-2001,
       Chapter 7, Locale, <ctype.h>

COPYRIGHT
       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       ISDIGIT(P)


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