Question

I’m stuck on a problem I’m trying to sort out with calculating multiple arrays.

Here’s the scenario…

A user will input their card number i.e. 1234, and then I need it multiple each number stored in another array in a sequence of 1,2,1,2.

So it would calculate in according 1 * 1, 2 * 2, 3 * 1, 4 * 2, etc.

I’ve tried a few different to calculate both inside a single foreach loop, however I’m having no such luck as I’m returning duplicates, so I’m seeing if there’s even a way I can combine both arrays into a single foreach loop?

I’m able to print the data, so now I’m just seeing how I can multiple them together. Here’s what I have so far…

class Program
{
    static void Main(string[] args)
    {
       Console.WriteLine("Enter your Card Number");
       char[] card = Console.ReadLine().ToCharArray();
       int[] card_m = { 1,2,1,2 };

       foreach (char c in card)
       {
           int number = (int)char.GetNumericValue(c);
           Console.WriteLine("Converted Number: {0}", number);
       }

       foreach (int m in card_m)
           Console.WriteLine("Card Number Multiplier: {0}", m);

       Console.Read();
    }
}

Answer 1

Assuming the arrays may be different lengths, use the modulus operator to loop on your multiplier array:

    static void Main(string[] args) {
        Console.WriteLine("Enter your Card Number");

        char[] card = Console.ReadLine().ToCharArray();

        int[] card_m = { 1, 2 };

        for (int idx = 0; idx < card.Length; idx++) {
            int number = (int) char.GetNumericValue(card[idx]);
            Console.WriteLine("Converted Number: {0}", number);

            // pull the multiplier from the card_m array
            int m = card_m[idx % card_m.Length];

            Console.WriteLine("Card Number Multiplier: {0}", m);
        }

        Console.Read();
    }