std:: putwchar

#include <clocale>
#include <cstdio>
#include <cstdlib>
#include <cwchar>
#include <initializer_list>
int main()
{
    std::setlocale(LC_ALL, "en_US.utf8");
    for (const wchar_t ch : {
        L'\u2200', // Unicode 名称："FOR ALL"
        L'∀',
        L'\n'
        })
        if (std::putwchar(ch) == WEOF)
        {
            std::puts("I/O error in std::putwchar");
            return EXIT_FAILURE;
        }
    return EXIT_SUCCESS;
}