Why are question marks displayed instead of Cyrillic characters?

Question

C++ / C#

#include <iostream>
#include <locale.h>
using namespace std;

void main()
{
  setlocale( LC_ALL,"Russian" );
  cout << "Тестовый текст\n";
  system("pause");
}

Answer 1

setlocale(lC_ALL, "en-us.UTF-8");
Of course, it must be present in the system.

Answer 2

www.nntp.perl.org/group/perl.unicode/2012/01/msg33...