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Credit Card Validation

This one seemed to be easy at first, but i found myself stuck with this coad coach) could anyone help me out? https://www.sololearn.com/coach/96?ref=app

9/2/2021 2:16:28 PM

Gopalov Mikhail

2 Answers

New Answer

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The first big problem you have is in converting of input into integer. Better will be to code: b[i] = Convert.ToInt32(Convert.ToString(a[i])); The second are the length of the for loops. Only the first for loop counts till end of your array.

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namespace Sololearn { class Program { static void Main(string[] args) { //1— turned string to int[]+ made a reverse string a =Console.ReadLine(); if (a.Length==16) { int [] b = new int [16]; int count =0; for (int i=0;i<=15;i++) { b[i] = (int)Char.GetNumericValue(a[15-i]); } //2 - doubled all the odd numbers for (int j=0;j<15;j+=2) { b[j]*=2; } for (int m =0;m<15;m++) { if (b[m]>9) // made a sum with a 9 substraction { b[m]-=9; count+=b[m]; } else { count+=b[m]; } } // sum validation and String Length validation if (count%10==0) { Console.WriteLine("valid"); } else { Console.WriteLine("not valid"); } } else { Console.WriteLine("not valid"); } } } }