How to Validate a Credit Card Number in Kotlin (Luhn Algorithm)
How to Validate a Credit Card Number in Kotlin (Luhn Algorithm)
Greetings, today I shall be showing you how to use the Luhn algorithm to validate a credit card number or debit card, using Kotlin.
The Luhn algorithm is a simple checksum formula used to validate the integrity of identification numbers such as credit card numbers.
The Luhn algorithm works by performing the following steps:
Double every other digit in the number, starting with the second-to-last digit and moving left.
If a doubled number is greater than 9, you mod the number by 10 and add 1 onto the remainder.
We then add up all the digits.
We then mod the total by 10. If the sum is a multiple of 10, we return true as it is a valid credit card, if not then false as the credit card is invalid.
Thanks for watching this Kotlin credit card number validation tutorial.
Numbers to use for testing: https://www.creditcardvalidator.org/g...
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How to Validate a Credit Card Number in Kotlin (Luhn Algorithm)
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