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Problem 8 Banks and credit card companies use a checksum algorithm known as the Luhn algorithm to verify credit card numbers and bank account numbers. Write a function that takes a credit card number (as a string) and returns True if it is a valid number and False if not. The algorithm is as follows: 1. Number the digits 0, 1, 2, ... 2. Keep track of the sum of all the even-indexed digits 3. The odd-indexed digits get passed to a function that multiplies the digit by 2 and then adds the digits. Ex. if 7 is the 3rd index, then we would really add 5 because 7 * 2 = 14 and 1+4 = 5. 4. After all the digits are added appropriately, valid bank accounts and credit cards will be evenly divisible by 10. Example IO: validate luhn ( '79927398713') #returns True validate luhn ( '79297398713') #returns False

Problem 8 Banks and credit card companies use a checksum algorithm known as the Luhn algorithm to verify credit card numbers and bank account numbers. Write a function that takes a credit card number (as a string) and returns True if it is a valid number and False if not. The algorithm is as follows: 1. Number the digits 0, 1, 2, ... 2. Keep track of the sum of all the even-indexed digits 3. The odd-indexed digits get passed to a function that multiplies the digit by 2 and then adds the digits. Ex. if 7 is the 3rd index, then we would really add 5 because 7 * 2 = 14 and 1+4 = 5. 4. After all the digits are added appropriately, valid bank accounts and credit cards will be evenly divisible by 10. Example IO: validate luhn ( '79927398713') #returns True validate luhn ( '79297398713') #returns False

Database System Concepts
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
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Problem 8 Banks and credit card companies use a checksum algorithm known as the Luhn algorithm to verify credit card numbers and bank account numbers. Write a function that takes a credit card number (as a string) and returns True if it is a valid number and False if not. The algorithm is as follows: 1. Number the digits 0, 1, 2, ... 2. Keep track of the sum of all the even-indexed digits 3. The odd-indexed digits get passed to a function that multiplies the digit by 2 and then adds the digits. Ex. if 7 is the 3rd index, then we would really add 5 because 7 * 2 = 14 and 1+4= 5. 4. After all the digits are added appropriately, valid bank accounts and credit cards will be evenly divisible by 10. Example IO: validate luhn ('79927398713') #returns True validate luhn ('79297398713’) #returns False
Transcribed Image Text:Problem 8 Banks and credit card companies use a checksum algorithm known as the Luhn algorithm to verify credit card numbers and bank account numbers. Write a function that takes a credit card number (as a string) and returns True if it is a valid number and False if not. The algorithm is as follows: 1. Number the digits 0, 1, 2, ... 2. Keep track of the sum of all the even-indexed digits 3. The odd-indexed digits get passed to a function that multiplies the digit by 2 and then adds the digits. Ex. if 7 is the 3rd index, then we would really add 5 because 7 * 2 = 14 and 1+4= 5. 4. After all the digits are added appropriately, valid bank accounts and credit cards will be evenly divisible by 10. Example IO: validate luhn ('79927398713') #returns True validate luhn ('79297398713’) #returns False
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