Luhn Algorithm

This project implements the Luhn Algorithm, which is used to validate 16-digit numbers.
It helps prevent transactions with randomly generated or fake credit card numbers.

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How the Algorithm Works

The Luhn Algorithm works as follows:

1. Take a 16-digit number
   Example: 4538 2349 8239 8239

2. Multiply the first digit by 2

   • If the result is greater than 10, add the digits together.
   • Example: 12 → 1 + 2 = 3
   • If the result is less than 10, use it as-is.
   • Example: 4 × 2 = 8 → result = 8

3. Write down the second digit as-is

   • Example: 5

4. Multiply the third digit by 2, and write the fourth digit as-is

   • Repeat this process for all digits.

5. Sum all the resulting digits

   • Example: Total = 99

6. Check if the total is divisible by 10

   • If divisible by 10, the number is a valid credit card number according to the Luhn Algorithm.
   • If not divisible by 10, the number cannot be a valid credit card number.

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About This Project

• The 16-digit number entered by the user is validated using the Luhn Algorithm.
• Based on the algorithm, the project indicates whether the number has the potential to be a valid credit card number.

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Note: The Luhn Algorithm only checks the correctness of the digits; it does not verify whether the card is real or active.