C++ special characters displays as “?”

Question

I want to print a box using special characters like this

      cout << "╔═══╗" << endl;
      cout << "║   ║" << endl;
      cout << "║   ║" << endl;
      cout << "╚═══╝" << endl;

but it displays like this

      ?????
      ?   ?
      ?   ?
      ?????

How can I fix this?

Answer 1

You could try this one:

cout << (char)201 << (char)205 << (char)187 << endl;
cout << (char)186 << " "       << (char)186 << endl;
cout << (char)186 << " "       << (char)186 << endl;
cout << (char)200 << (char)205 << (char)188 << endl;

I tested it and prints what you want

Answer 2

Find out what character set the terminal you are viewing the program output on is using, then use escape codes to put those characters in your strings

There are several types and editor you are programming with may be using a different kind the program displays with.

https://en.wikipedia.org/wiki/Box-drawing_character