(Financial: credit card number validation) Rewrite Exercise 6.29 using a string input for a cred

step 1 Good day, ladies and gentlemen. Today we're looking at problem number 814. It is credit card val

(Financial: credit card number validation) Rewrite Exercise...

Key Concepts

Algorithmic Checksum Verification

This key concept refers to the use of specific algorithms, like the Luhn algorithm, to calculate and verify a check digit that ensures the credit card number has the correct format and integrity. These methods are critical in detecting errors or fraudulent entries in financial applications.

String Input Handling

This concept involves accepting user input in the form of a string rather than a numerical type. It allows programs to easily capture data that may include non-numeric characters or require preservation of formatting, and it lays the groundwork for further processing such as validation and parsing.

Credit Card Number Validation

Credit card number validation is the process of verifying that a provided credit card number adheres to established criteria for structure and numerical correctness. Such validations often rely on algorithms that check digit patterns and the card number’s integrity without needing to access sensitive account information.

Data Parsing and Conversion

Data parsing involves extracting meaningful components from a string input, such as isolating individual digits from a credit card number. Conversion may then be applied to transform these characters into numeric values, which is essential for performing algorithmic checks and validations.

Transcript

00:02 Good day, ladies and gentlemen.

00:04 Today we're looking at problem number 814.

00:08 It is credit card validation.

00:12 Now, this problem, again, is another bit of a, well, the bit of a tedious one.

00:21 There's a few steps to it.

00:22 So i'm just going to talk you through the basic idea of it, and then i'm going to show you the code as to how i get it.

00:31 And really, the author pretty much lays out the solution in section 6 .2, or at least gives you the basic idea.

00:43 The major difference between 6 .29, and this one is that in this one, it's really treating it as a string instead of a, instead of, i guess, what it was before was just not even sure.

01:00 Was it integers? i'm not even sure.

01:02 Anyhow, so this time we're treating it more as a string.

01:05 So the basic idea goes like this.

01:10 You know, that first of all, the card has to be between 12 and 17, well, greater than 12 and less than 17.

01:20 And that you have to break the card into the odd.

01:25 Digits and the even digits and the odd digits.

01:29 On the even digits, so the digits 0, 2, 4, so on and so forth, you take each digit and then you multiply it by 2.

01:42 And of course, if the value is less than 10, you just add that value to what i call even sum.

01:52 Otherwise, you take the digits of the value and you add this value to the even sum.

02:05 So in other words, you break if we have, oops, i'm sorry about that.

02:13 I hate this when this happens.

02:17 So if it's an even number, you take, for instance, if it's 12, then you, this is really annoying.

02:38 Yeah.

02:43 So if it's 12, you add that together 1 plus 2 to get 3.

02:48 And then you take all those values and you add that to even some.

03:02 Okay.

03:04 And then with the odd values, you just add all the entries up to get the odd sum.

03:11 And then you add the odds sum up and even sum, and you mod that by 10.

03:18 And if it's zero, you return true.

03:21 And it helps you return false...

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