#include <wctype.h> wctype_t wctype(const char *charclass); wctype is defined for valid character class names as defined in the current locale. The charclass is a string identifying a generic character class for which codeset-specific type information is required. The following character class names are defined in all locales:
"alnum", "alpha", "blank", "cntrl", "digit", "graph", "lower", "print", "punct", "space", "upper" and "xdigit".
Additional character class names defined in the locale definition file (category LC_CTYPE) can also be specified. The function returns a value of type wctype_t, which can be used as the second argument to subsequent calls of iswctype. The wctype function determines values of wctype_t according to the rules of the coded character set defined by character type information in the program ́s locale (category LC_CTYPE). The values returned by wctype are valid until a call to setlocale that modifies the category LC_CTYPE. | 