The standard provides for namespace and character type support.
| <cctype.h> | <cwctype.h> | <cwctype.h> | <cwctype.h> |
|---|---|---|---|
| isalnum | iswalnum | isprint | iswprint |
| isalpha | iswalpha | ispunct | iswpunct |
| iscntrl | iswcntrl | isspace | iswspace |
| isdigit | iswdigit | isupper | iswupper |
| isgraph | iswgraph | isxdigit | iswxdigit |
| islower | iswlower | isprint | iswprint |
| isalnum | iswalnum | toupper | towupper |
| tolower | towlower | iswctype | |
| wctype | towctrans | ||
| wctrans | EOF | WEOF |