How to resolve the algorithm Luhn test of credit card numbers step by step in the LiveCode programming language

Published on 12 May 2024 09:40 PM
#Livecode

How to resolve the algorithm Luhn test of credit card numbers step by step in the LiveCode programming language

Table of Contents

Problem Statement

The Luhn test is used by some credit card companies to distinguish valid credit card numbers from what could be a random selection of digits. Those companies using credit card numbers that can be validated by the Luhn test have numbers that pass the following test:

For example, if the trial number is 49927398716:

Write a function/method/procedure/subroutine that will validate a number with the Luhn test, and use it to validate the following numbers:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Luhn test of credit card numbers step by step in the LiveCode programming language

Source code in the livecode programming language

function LuhnTest cc
    local s1,evens, s2
    repeat with n = 1 to len(cc)
        if n mod 2 is not 0 then
            add (char -n of cc) to s1
        else
            put (char -n of cc) * 2 into evens
            if evens > 9 then subtract 9 from evens
            add evens to s2
        end if
    end repeat
    return the last char of (s1 + s2) is 0
end LuhnTest

-- test
repeat for each item ccno in "49927398716,49927398717,1234567812345678,1234567812345670"
    put ccno && LuhnTest(ccno) & cr after luhncheck
end repeat
put luhncheck

49927398716 true
49927398717 false
1234567812345678 false
1234567812345670 true

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