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Luhn Formula Demo C#
//Rextester.Program.Main is the entry point for your code. Don't change it. //Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5 using System; using System.Collections.Generic; using System.Linq; using System.Text.RegularExpressions; namespace Rextester { public static class Luhn { public static bool LuhnCheck(this string cardNumber) { return LuhnCheck(cardNumber.Select(c => c - '0').ToArray()); } private static bool LuhnCheck(this int[] digits) { return GetCheckValue(digits) == 0; } private static int GetCheckValue(int[] digits) { return digits.Select((d, i) => i % 2 == digits.Length % 2 ? ((2 * d) % 10) + d / 5 : d).Sum() % 10; } } public class Program { public static void Main(string[] args) { long[] testNumbers = {800112794657, 6011000990139424}; foreach (var testNumber in testNumbers) Console.WriteLine("{0} is {1}valid", testNumber, testNumber.ToString().LuhnCheck() ? "" : "not "); } } }
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