NAME    [Toc]    [Back]

     isupper - upper-case character test

SYNOPSIS    [Toc]    [Back]

     #include <ctype.h>

     int
     isupper(int c);

DESCRIPTION    [Toc]    [Back]

     The isupper() function tests for any  upper-case  letter  or
any of an implementation-defined
 set of characters for which none of iscntrl(3),
     isdigit(3), ispunct(3), or isspace(3) is true.  In the C locale,
     isupper()  returns  true  only for the characters defined as
upper-case letters.

RETURN VALUES    [Toc]    [Back]

     The isupper() 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),
isdigit(3),
     isgraph(3), islower(3), isprint(3), ispunct(3),  isspace(3),
isxdigit(3),
     stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

STANDARDS    [Toc]    [Back]

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

CAVEATS    [Toc]    [Back]

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

OpenBSD      3.6                           June      29,     1991