Character Support

The standard provides for namespace and character type support.

Table 1. Character support testing
<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