Print wchar_t emoji on console using wcout in C ++ weird behavior

Question

I am trying to print emoji on a standard output console in C ++ on Mac OS X - clang.

This first code works correctly:

#include <iostream>
#include <cwchar>

int main(int argc, const char *argv[]){
  char myEmoji[4] = "⛩";
  std::cout << "emoji example: " << myEmoji << std::endl;
  return 0;
}

and on the console I see:

./emoji ; exit
emoji example: ⛩
logout

When I try to do this, it unexpectedly works for me:

#include <iostream>
#include <cwchar>

int main(int argc, const char *argv[]){
  wchar_t myEmoji = L'⛩';
  std::wcout << "emoji example: " << myEmoji << std::endl;
  return 0;
}

and this time I get:

./emoji ; exit
emoji example: logout

Where am I mistaken?