NAME

       isupper - test for an uppercase letter

SYNOPSIS

       #include <ctype.h>

       int isupper(int c);

DESCRIPTION

       The  isupper()  function  shall  test  whether  c  is a character of class upper 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 isupper() function shall return non-zero if c is an uppercase letter; 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() , isdigit() , isgraph() , islower() , isprint() , ispunct() , isspace()
       , isxdigit() , setlocale() , 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 .