isdigit(3p) - phpMan

ISDIGIT(P)                                                          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
       function  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() ,
       isspace()   ,   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  original  Standard  can   be   obtained   online   at
       http://www.opengroup.org/unix/online.html .



POSIX                                2003                           ISDIGIT(P)

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