Before:

// Playing blackjack
anotherCard = 'y';
while( 'y' == anotherCard )
{
    // Deal another card
    cardFace = rand() % 13 + 1;

    // Add it to the user's hand - maximum 10
    if( cardFace < 10 )
        sumOfCards = sumOfCards + cardFace;
    else
        sumOfCards = sumOfCards + 10;
    cout << "The sum of your cards so far is " << sumOfCards << endl;

    // Ask whether the user wants another card
    cout << "Do you want another card dealt to you (y/n/)?" << endl;
    cin >> anotherCard;
    anotherCard = tolower( anotherCard );
}