iswupper(3) Library Functions Manual iswupper(3) iswupper - (libc -lc) #include int iswupper(wint_t wc); iswupper() isupper(3). wc "upper". "upper" "alpha" "alnum" "graph" "print". "print" "upper" "cntrl". "graph" "upper" "space" "blank". "alnum" "upper" "punct". "alpha" "upper" "digit". "upper" wc towupper(wc) towlower(wc). "upper" 'A' 'Z'. iswupper() wc "upper". . attributes(7). +----------------------+------------------------------------+---------------------------------------------------------------------------------------------+ | | | | +----------------------+------------------------------------+---------------------------------------------------------------------------------------------+ |iswupper() | | (locale) (MT-Safe) | +----------------------+------------------------------------+---------------------------------------------------------------------------------------------+ C11, POSIX.1-2008. POSIX.1-2001 C99. iswupper() LC_CTYPE . : . isupper(3), iswctype(3), towupper(3) 3 . . : . 6.18 8 2026 iswupper(3)