Is It Possible To Do The Following In A Switch Statement - C++?

No, this is usually the purview of the if statement:

if ((userInputtedInt >= someNum) && (userInputtedInt <= someOtherNum)) { ... }

Of course, you can incorporate that into a switch statement:

switch (x) {
    case 1:
        // handle 1
        break;
    default:
        if ((x >= 2) && (x <= 20)) { ... }
}

No this is not possible in C++. Switch statements only support integers and characters (they will be replaced by their ASCII values) for matches. If you need a complex boolean condition then you should use an if / else block

As others have said you can't implement this directly as you are trying to do because C++ syntax doesn't allow it. But you can do this:

switch( userInputtedInt )
{
  // case 0-3 inclusve
  case 0 :
  case 1 :
  case 2 :
  case 3 :
    // do something for cases 0, 1, 2 & 3
    break;

  case 4 :
  case 5 :
    // do something for cases 4 & 5
    break;
}