using System;

​

public class Program

{

    public static void Main(string[] args)

    {

        var addArray = new string[]

        {

            "2",

            "4.0",

            "4",

            "5",

            "6",

            "7",

            "cat"

        };

        var numerator = 4;

        var denominator = 16;

        Exception err;

        // Add 

        (int addTotal, err) = AddArray(addArray);

        if (err != null)

            Console.WriteLine(err.Message);

        else

            Console.WriteLine(addTotal);

        // Divide

        (double divideTotal, err) = Divide(numerator, denominator);

        if (err != null)

            Console.Write(err.Message);

        else

            Console.WriteLine(divideTotal);

    }

​

    public static (int, Exception) AddArray(string[] arrayToAdd)

    {

        int total = 0;

        // Code Here

        return (total, null);

    }

​

    public static (double, Exception) Divide(int val1, int val2)

    {

        var divideTotal = 0;

        // Code Here

        return (divideTotal, null);

    }

}