ARM, C# - rextester

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//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 class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            string start;

Console.WriteLine("ARM Software Developer Test Questions");
            Console.WriteLine("Created by -- Eyiwunmi Dawodu 07011860291");
            Console.WriteLine("Question 1 and 3 were answered");
            do
            {
                Console.WriteLine("Enter 1 to run question 1 and 3 to enter question 3");
                string userInput;
                int select = 0;
                bool isNum;
                do
                {
                    userInput = Console.ReadLine();
                    isNum = int.TryParse(userInput, out select);
                }
                while (isNum == false);
                if (select == 1)
                {
                    Console.WriteLine("Given an array and a number k where k is smaller than size of array, ");
                    Console.WriteLine("find the k’th smallest element in the given array. It is given that all array elements are distinct.");
                    Console.WriteLine("Array = { 7, 10, 4, 3, 20, 15 }");
                    Console.WriteLine("Smallest Number");
                    int[] arr = { 7, 10, 4, 3, 20, 15 };
                    int k = 3;
                    int result = Question1(arr, k);
                    Console.WriteLine(result);
                }
                else if (select == 3)
                {
                    Console.WriteLine("Given a set of non-negative integers, and a value sum, determine if there is a subset ");
                    Console.WriteLine("of the given set with sum equal to given sum.");
                    Console.WriteLine("Array = { 3, 34, 4, 12, 5, 2 }");
                    int[] set = { 3, 34, 4, 12, 5, 2 };
                    var result = Question3(set);
                    Console.WriteLine(result.Firstnum + " -- " + result.Secondnum);
                }
                else
                {
                    Console.WriteLine(select + " is not a valid option.");
                }

Console.WriteLine("Next question? Yes / No");
                Console.WriteLine("\n");
                start = Console.ReadLine();
            }
            while (start.ToLower() == "yes");
        }

public static int Question1(int[] inputArrays, int k)
        {
            Array.Sort(inputArrays);
            var smallval = inputArrays[k - 1];
            return smallval;
        }

public static Res Question3(int[] inputArrays)
        {
            Array.Sort(inputArrays);
            Res result = new Res();
            int arrLenght = inputArrays.Length;
            for (int a = 0; a < arrLenght; a++)
            {
                for (int b = 1; b < arrLenght; b++)
                {
                    if (inputArrays[a] + inputArrays[b] == 9)
                    {
                        result.Firstnum = inputArrays[a];
                        result.Secondnum = inputArrays[b];
                        return result;
                    }
                }
            }
            return result;
        }

public class Res
        {
            public int Firstnum { get; set; }
            public int Secondnum { get; set; }
        }
    }
}

Show compiler warnings [ - ] Show input
Compilation time: 0,16 sec, absolute running time: 5,03 sec, cpu time: 5,02 sec, average memory usage: 23 Mb, average nr of threads: 5