Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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form validation for my card number using modulus. i need to add this code to my jscode not on html script. and add it to formhaserror function.

Modulus Check Logic

For this project, we will be taking in 10 digit credit card numbers. Ensure the user entered only 10 numbers. If they pass this check, perform a modulus check to ensure that the user has submitted a valid credit card number.

Note that the checking factors below are the literal checking factors you will use in your solution.

Sample Credit Card Number

9434578423

Checking Factors

432765432

Multiply Checking Factors by Credit Card digits and Sum

(9 * 4) + (4 * 3) + (3 * 2) + (4 * 7) + (5 * 6) + (7 * 5) + (8 * 4) + (4 * 3) + (2 * 2) = 195

Divide the Sum by 11

195 / 11 = 17, gives a remainder of 8

Subtract

11 - 8 = 3 (this is the check digit)

Compare the check digit to the last digit in the credit card number

9434578423

The credit card number is valid when the check digit and the last digit in the credit card number are equal.

The following valid credit card numbers can be used for testing:

1111111118

2222222225

4111313135

2234321326

Note:

The "%" is the mathematical operator used to get the remainder.

Examples:

10 % 5 = 0, there is no remainder

10 % 3 = 1, there is a remainder of 1

here is the whole folder for the precode.

https://drive.google.com/file/d/1VdEXWjabTtcfNKN7zjm4kCRvB80mVQJw/view?usp=share_link

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