![]() How to Design an algorithm in c program? I want to learn C programming algorithms.? How can I describe an algorithm using C. Luhn's Algorithm ( C programming)? Credit card numbers follow certain patterns. If the two do not match, the number is refused. Therefore, when a number is entered into the system (manually or otherwise), the computer can instantly verify that the final digit matches the digit predicted by the check digit algorithm. Using the proper algorithm, the final digit can always be calculated. Check digits help to reduce the likelihood of errors by introducing a final digit that is calculated from the prior digits. Have you ever mis- dialed a phone number? It happens. Inadvertent keystrokes or fatigue can cause digits to be rearranged, dropped, or inserted. ![]() Any time identifiers (typically number +/- letters) are being manually entered via keyboard, there will be errors. ![]() Why bother with check digits? The purpose of check digits is simple.
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