On the Web, research the Luhn formula that is used to verify credit card numbers. Write a program that allows the user to enter a 16-digit account number in groups of four, and display a 1 or 0 that indicates whether the credit card number is valid or invalid. If you have access to one, test the program with a MasterCard or Visa account number to verify that it works correctly. Save the file as Luhn.cpp.
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