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The proximate reason for 378282246310005 not being identified as Amex is this number > (long) pow(10, 15) is false. Remember pow(10,15) is a 16 digit number. visual compare for the humans 1,000,000,000,000,000 378,282,246,310,005 I would not expect the posted code to loop back to the start; there is no loop in the code.


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