if statements with char values

So I'm trying to write an easy basic game here with basic C++, and when I try to execute this

// global variabless
const char UP = 'w', LEFT = 'a', DOWN = 's', RIGHT = 'd'; // player movement choices
char playerMove; // goes with askPlayer

void askPlayer()
{
    char choice;
    cout << "Use the WASD keys to move: ";
    cin >> choice;
    int worked;

    do{
        if (choice == 'w' || choice == 'W')
        {
            playerMove = UP;
            worked = 1;
        }
        else if (choice == 'a' || choice == 'A')
        {
            playerMove = LEFT;
            worked = 1;
        }
        else if (playerMove == 's' || playerMove == 'S')
        {
            playerMove = DOWN;
            worked = 1;
        }
        else if (playerMove == 'd' || playerMove == 'D')
        {
            playerMove = RIGHT;
            worked = 1;
        }
        else
        {
            cout << "Invalid entry." << endl;
            worked = 0;
        }
    } while (worked != 1);
    return;
}

It works up to the user entering a letter. Xcode says (lldb) then the page fills up with numbers, and after you stop the run, it says "Program ended with exit code: 9". It does this even if you enter one of the valid values