MirBSD manpage: isupper(3)

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


     isupper - upper-case character test


     #include <ctype.h>

     isupper(int c);


     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.


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


     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)


     The isupper() function conforms to ANSI X3.159-1989 ("ANSI C89").


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

MirBSD #10-current              June 29, 1991                                1

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