using System;

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namespace project3

{

    public class Program

    {

        public static void Main(string[] args)

        {

            var customers = new Customer[5]

            {

                new Customer()

                {

                    Age = 15,

                    FirstName = "15",

                    LastName = "15"

                },

                new Customer()

                {

                    Age = 16,

                    FirstName ="16",

                    LastName = "16"

                },

                new Customer()

                {

                    Age = 25,

                    FirstName= "25",

                    LastName = "25"

                },

                new Customer()

                {

                    Age = 37,

                    FirstName = "37",

                    LastName = "37"

                },

                new Customer()

                {

                    Age = 55,

                    FirstName = "55",

                    LastName = "37"

                },

            };

​

            var customersFound = new Customer[5];

            Console.WriteLine("Insert customer last name");

            var lastName = Console.ReadLine();

            var customersFoundCounter = 0;

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            foreach (var customer in customers)

            {

                if (lastName == customer.LastName)

                {

                    customersFound[customersFoundCounter] = customer;

                    customersFoundCounter += 1;

                }

            }

            foreach (var customer in customersFound)

            {

                if (customer != null)

                {

                    Console.WriteLine("Customer's first name is" + " " + customer.FirstName + " "+ "and last name is" + " " + customer.LastName);

                    //$"Customer's first name is {customer.FirstName} and last name is {customer.LastName}"

                }

            }

            Console.WriteLine(customersFound.Length);

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            Array.Resize(ref customersFound, customersFoundCounter);

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            foreach (var customer in customersFound)

            {

                if (customer != null)

                {

                    Console.WriteLine("Customer's first name is"+" "+ customer.FirstName +" and last name is" + " " + customer.LastName);

                    //$"Customer's first name is {customer.FirstName} and last name is {customer.LastName}"

                }

            }

            Console.WriteLine(customersFound.Length);

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        }

    }

        }

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   public class Customer

    {

        public int Age { get; set; }

        public string Email { get; set; }

        public int VatNumber { get; set; }

        public  string FirstName { get; set; }

        public string LastName { get; set; }

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        public string GetFullName()

        {

            return FirstName + " " + LastName; // $"{FirstName} {LastName}"

        }

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        public bool IsAdult()

        {  

            return Age >= 18; // Age >= 18 ? true : false

        }

        public bool SetMailAddress(string email)

        {

            var isValid =

                !string.IsNullOrWhiteSpace(email) &&

                email.Contains("@") &&

                (email.EndsWith(".com") ||

                email.EndsWith(".gr"));

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             if (isValid)

            {

                Email = email;

                return true;

            }

            else

            {

                return false;

            }

        }

    }

​

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