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