Python Starting with the right-most digit and moving to the left, determine the sum of every alternating digit. For the credit card “4833 1200 3412 3456”, we would sum 6 + 4 + 2 + 4 + 0 + 2 + 3 + 8 = 29. Double each of the digits not included in the previous step and then add all of the digits of the resulting numbers. For example, with the number given in step 1, doubling the digits, starting with the second-to-last one, yields 10 6 2 6 0 2 6 8. Adding all of the digits in these values yields 1 + 0 + 6 + 2 + 6 + 0 + 2 + 6 + 8 = 31. Add the sums of the two preceding steps. If the last digit of the result is zero (i.e., it is divisible by 10), the number is valid. In our case, 29 + 31 = 60, so the credit card number is valid. Example Execution #1 Input a credit card number to check its validity. NUMBER> 6 0 1 1 624 9 8671 7892 7 8 9 9 Sum 1: 46 Sum 2: 56 Overall Sum: 102 The credit card number is invalid. OUTPUT Invalid The correct check digit is 7. OUTPUT 7 Example Execution #2 Input a credit card number to check its validity. NUMBER> 5456 6874 5689 3405 Sum 1: 46 Sum 2: 24 Overall Sum: 70 The credit card number is valid. OUTPUT Valid Example Execution #3 Input a credit card number to check its validity. NUMBER> 4543 656 7 3323 6761 Sum 1: 34 Sum 2: 38 Overall Sum: 72 The credit card number is invalid. OUTPUT Invalid The correct check digit is 9. OUTPUT 9

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Example Execution #1

Input a credit card number to check its validity.
NUMBER> 6 0 1 1 624 9 8671 7892 7 8 9 9
Sum 1: 46
Sum 2: 56
Overall Sum: 102
The credit card number is invalid.
OUTPUT Invalid
The correct check digit is 7.
OUTPUT 7

Example Execution #2

Input a credit card number to check its validity.
NUMBER> 5456 6874 5689 3405
Sum 1: 46
Sum 2: 24
Overall Sum: 70
The credit card number is valid.
OUTPUT Valid

Example Execution #3

Input a credit card number to check its validity.
NUMBER> 4543 656 7 3323 6761
Sum 1: 34
Sum 2: 38
Overall Sum: 72
The credit card number is invalid.
OUTPUT Invalid
The correct check digit is 9.
OUTPUT 9

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