<wctype.h>

The <wctype.h> header file declares the following wide character functions:

iswalnum
iswalpha
iswblank
iswcntrl

iswdigit
iswgraph
iswlower
iswprint

iswpunct
iswspace
iswupper
iswxdigit

iswctype
towlower
towupper
towctrans

wctype
wctrans

The <wctype.h> header file also contains declarations and definitions for wide character classification. These declarations and definitions are not available when LOCALETYPE(*CLD) is specified on the compilation command.