Write a programme on credit card number check

Assignment Help C/C++ Programming

Reference no: EM13164308

Credit Card Number Check. The last digit of a credit card number is the check digit, which protects against

transcription errors such as an error in a single digit or switching two digits. The following method is used to

verify actual credit card numbers but, for simplicity, we will describe it for numbers with 8 digits instead of 16:

Starting from the rightmost digit, form the sum of every other digit. For example, if the credit card

number is 43589795, then you form the sum: 5 + 7 + 8 + 3 = 23.

Double each of the digits that were not included in the preceding step. Add all digits of the resulting

numbers. For example, with the number given above, doubling the digits, starting with the next-to-last

one, yields: 18 18 10 8. Adding all digits in these values yields: 1 + 8 + 1 + 8 + 1 + 0 + 8 = 27.

Add the sums of the two preceding steps. If the last digit of the result is 0, the number is valid. In our

case, 23 + 27 = 50, so the number is valid.

Write a program that implements this algorithm. The user should supply an 8-digit number, and you should print

out whether the number is valid or not. HINTS: look at digitStripper.cpp and try to do this problem by hand for

the second example below before trying to write code.

Example runs (with user input indicated with bold italics):

Please enter 8-digit card number: 43589795

Card is valid.

Please enter 8-digit card number: 43589796

Card is not valid.

Reference no: EM13164308

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