C: datatype wchar

Macros

Some macros can be used to describe the wchar_t type.

Including <wchar.h> makes the macro WCHAR_MAX available.

At least gcc also defines some __WCHAR* macros:

#include <stdio.h>

//
//  <wchar.h> seems to be needed for WCHAR_MAX.
//
#include <wchar.h>

//
//  See
//    https://renenyffenegger.ch/notes/development/languages/C-C-plus-plus/CPP/preprocessor/macros/stringify
//  for QuoteIdent and QuoteMacro
//
#define QuoteIdent(ident) #ident
#define QuoteMacro(macro) QuoteIdent(macro)

#define printMacroDefinition(macro) printf("%-22s %s\n", #macro ":", QuoteMacro(macro));

int main() {

  printMacroDefinition(WCHAR_MAX         )
  printMacroDefinition(__SIZEOF_WCHAR_T__)
  printMacroDefinition(__WCHAR_MAX__     )
  printMacroDefinition(__WCHAR_MIN__     )
  printMacroDefinition(__WCHAR_UNSIGNED__)
  printMacroDefinition(__WCHAR_TYPE__    )

}

Github repository about-c, path: /datatypes/wchar_t/macros.c

This program might print something like

WCHAR_MAX:             0x7fffffff
__SIZEOF_WCHAR_T__:    4
__WCHAR_MAX__:         0x7fffffff
__WCHAR_MIN__:         (-0x7fffffff - 1)
__WCHAR_UNSIGNED__:    __WCHAR_UNSIGNED__
__WCHAR_TYPE__:        int

C: datatype wchar_t

Macros

See also