Talk:cpp/header/cctype

Are you sure about this UB you mention in articles about these functions? See http://en.cppreference.com/w/Talk:cpp/string/byte/toupper

yes, see 7.4p1 in C11, C99, 4.3p1 in C89 --Cubbi (talk) 07:27, 28 January 2016 (PST)