A- Write a C# CLI program to read three numbers and find the maximum ( largest ) number. B- Modify the program to read ten numbers and find the second largest number.

ProgramA.cs

//Answer to A
using System;
using System.Linq;

namespace ConsoleApp2_for_test
{
    class Program
    {
        public static void Main()
        {
            Console.WriteLine("Input 3 numbers to find the largest");
            var num1 = Console.ReadLine();
            var num2 = Console.ReadLine();
            var num3 = Console.ReadLine();
            var largestNumber = FindLargestNumber(int.Parse(num1), int.Parse(num2),int.Parse(num3));
            Console.WriteLine($"The largest number is {largestNumber} ");
        }

        public static int FindLargestNumber(params int[] numbers)
        {
            return numbers.Max();
        }
    }
}

ProgramB.cs

//Answer to B
using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp2_for_test
{
    class Program
    {
        private const int NumberOfNumberToInput = 10;
        public static void Main()
        {
            Console.WriteLine($"Input {NumberOfNumberToInput} numbers to find the second largest");
            var numberArray = new List<int>();
            for (int i = 0; i < NumberOfNumberToInput; i++)
            {
                var input = Console.ReadLine();
                 numberArray.Add(int.Parse(input));
            }
            var secondLargetsNumber = FindSecondLargestNumber(numberArray.ToArray());
            Console.WriteLine($"The second largest number is {secondLargetsNumber} ");
        }

        public static int FindLargestNumber(params int[] numbers)
        {
            return numbers.Max();
        }

        public static int FindSecondLargestNumber(params int[] numbers)
        {
            var orderedList = numbers.OrderByDescending(n => n).ToArray();
            return orderedList[1];
        }
    }
}

Example run A

Example run B