Credit card check digit

- Multiple
**credit card**numbers can be**checked**at once. In the input field enter each**credit card**number on a separate line. The**credit card**numbers can only contain numbers, spaces, dots (.) or dashes (-). For example. 1234567812345678. - Start from the rightmost
**digit**(i.e.**check****digit**) 2. Multiply every second**digit**by 2 (i.e.**digit**at even positions) 3. If the result in step 2 is more than one**digit**, add them up (E.g. 12: 1+2 =... - Add all the
**digits**together 3+8+7+3+0+9+6+9+2+2+0+4+9+2 = 64. Multiply the result by 9, 64 * 9 = 576. Take the last**digit**of the result 6. If this matches the**check****digit**, then we have a valid sequence. Since our**check****digit**6 matches our result 6, we conclude that this sequence is a valid**credit****card**number. The**credit****card**number (also known as PAN, which is the short for Payment <b>Card ... - 2018. 11. 2. · Here is the logic behind the condition that must be satisfied: Step 1: Let’s consider the
**card**number as 1802909582961827. Step 2: As of now, just consider first 15**digits**i.e., 180290958296182 ... - The Luhn algorithm ("modulus 10" or "mod 10" algorithm, Luhn formula) is a simple checksum formula used to validate a variety of identification numbers, such as
**credit****card**numbers (PAN) or IMEI numbers. The algorithm is specified in ISO/IEC 7812 -1. The algorithm was designed to protect against accidental errors.