isupper(3) - NetBSD Manual Pages

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ISUPPER(3)                NetBSD Programmer's Manual                ISUPPER(3)


NAME

     isupper - upper-case character test


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <ctype.h>

     int
     isupper(int c);


DESCRIPTION

     The isupper() function tests for any upper-case letter or any of an im-
     plementation-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 let-
     ters.


RETURN VALUES

     The isupper() macro returns zero if the character tests false and returns
     non-zero if the character tests true.


SEE ALSO

     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

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

NetBSD 1.5.2                     June 29, 1991                               1