My credit card checker

Hello, @bit2736304594, and welcome to the forums.

I ran your code. It returns valid3 as invalid.
It also returns mystery3 as valid, but it is an invalid number.


Your code always starts at the beginning of the card number array, and doubles every other digit. The problem occurs when a card number has an odd number of digits.

1 Like

Thank you!!! I saw were I went wrong.

1 Like