iswupper

int iswupper( wint_t ch );

Checks if the given wide character is an uppercase letter, i.e. one of ABCDEFGHIJKLMNOPQRSTUVWXYZ or any uppercase letter specific to the current locale.

Parameters

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 <stdio.h>
#include <wchar.h>
#include <wctype.h>
#include <locale.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));
}

in the default locale, iswupper(0x53d) = 0
in Unicode locale, iswupper(0x53d) = 1

References

• C11 standard (ISO/IEC 9899:2011):
• 7.30.2.1.11 The iswupper function (p: 451)
• C99 standard (ISO/IEC 9899:1999):
• 7.25.2.1.11 The iswupper function (p: 397)

See also