C++ <cwctype> - wctype() Function

The C++ <cwctype> wctype() function returns a value of type wctype_t that corresponds to the character category specified by property.

The value returned by this function depends on the LC_CTYPE category selected. A specific locale can accept multiple categories in which to classify its characters.

Syntax

wctype_t wctype (const char* property);            

Parameters

Return Value

Returns a value of type wctype_t identifying a specific character category. This value is locale-dependent. Returns zero if property does not name a category supported by the current C locale.

Example:

The example below shows the usage of wctype() function.

#include <cstdio>
#include <cwchar>
#include <cwctype>
 
int main (){
  int i = 0;
  wchar_t str[50] = L"99HEllo@";
  wchar_t c;

  //displaying the alphabetic 
  //character in upper case
  wctype_t check = wctype("alpha");
  wctrans_t trans = wctrans("toupper");
  while (str[i]) {
    c = str[i];
    if (iswctype(c, check)) {
      c = towctrans(c, trans);
      putwchar (c);      
    }
    i++;
  }
  return 0;
}

The output of the above code will be:

HELLO