using System;
using System.ComponentModel.DataAnnotations;

namespace ConsoleApp1
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            int[] arr = { -10, -5, 0, 10, 20 };
            MinMaxNumber(arr);
        }

        public static void MinMaxNumber(int[] numberList)
        {
            int min = numberList[0];
            int max = numberList[0];
      
            foreach (int number in numberList)
            {
                min = (number < min) ? number : min;
                max = (number > max) ? number : max;
            }
            Console.WriteLine("The minimum number is {0}", min);
            Console.WriteLine("The maximum number is {0}", max);
        }
    }
}