iswupper
Header: <wctype.h>
Checks if the given wide character is an uppercase letter, i.e. one of ABCDEFGHIJKLMNOPQRSTUVWXYZ or any uppercase letter specific to the current locale.
# Declarations
int iswupper( wint_t ch );
(since C95)
# Parameters
ch: wide character
# Return value
Non-zero value if the wide character is an uppercase letter, zero otherwise.
# Notes
ISO 30112 specifies which Unicode characters are include in POSIX upper category.
# Example
#include <locale.h>
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
int main(void)
{
wchar_t c = L'\u053d'; // Armenian capital letter xeh ('Խ')
printf("In the default locale, iswupper(%#x) = %d\n", c, !!iswupper(c));
setlocale(LC_ALL, "en_US.utf8");
printf("In Unicode locale, iswupper(%#x) = %d\n", c, !!iswupper(c));
}