double cardTypeInterestAmount(string card)
{
creditCardType cardType = (creditCardType)Enum.Parse(typeof(creditCardType), card);
switch (cardType)
{
case creditCardType.Visa:
Visa visaCard = new Visa();
return visaCard.GetInterest();
case creditCardType.MasterCard:
MasterCard mcCard = new MasterCard();
return mcCard.GetInterest();
case creditCardType.Discover:
Discover discover = new Discover();
return discover.GetInterest();
}
return 0.0;
}
