antikeimenostrafhs katalogos

using System;

namespace ConsoleApp2
{
    public class Person
    {
        public string name;
        public string phone;
    }

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Please instert the number of entries needed.");
            int entriesNumber = int.Parse(Console.ReadLine());
            entriesNumber++;
            Person[] tester = new Person[entriesNumber];
            for (int i = 0; i < entriesNumber; i++)
            {
                tester[i] = new Person();
            }

            int choice = -1;
            Console.WriteLine("Please select a choice from the following:\n1)Enter a new entry\n2)Delete an entry\n3)Search for an entry\n4)Show existing entries\nOr\n0)Exit");
            choice = int.Parse(Console.ReadLine());

            while (choice != 0)
            {
                choice = int.Parse(Console.ReadLine());
                //deixnei entries
                if (choice == 1)
                {
                    Console.WriteLine("#\tName\tPnone");
                    Console.WriteLine("----------------------");

                    for (int i = 0; i < entriesNumber; i++)
                    {
                        Console.WriteLine("{0}\t{1}\t{2}", i, tester[i].name, tester[i].phone);
                    }
                }

                //eisageis entries
                else if (choice == 2)
                {
                    Console.WriteLine("Entry number?");
                    int i = int.Parse(Console.ReadLine());

                    if (i < entriesNumber && i >= 0)
                    {
                        Console.WriteLine("Name?");
                        tester[i].name = Console.ReadLine();
                        Console.WriteLine("Phone?");
                        tester[i].phone = Console.ReadLine();
                    }

                    else
                    {
                        Console.WriteLine("Please insert a valid entry");
                    }
                }

                //diagrafeis entries
                else if (choice == 3)
                {
                    Console.WriteLine("Entry number?");
                    int i = int.Parse(Console.ReadLine());

                    if (i < entriesNumber && i >= 0)
                    {
                        tester[i].name = null;
                        tester[i].phone = null;
                    }

                    else
                    {
                        Console.WriteLine("Please insert a valid entry");
                    }
                }

                //psaxneis na breis an ena onoma pou dinei o xrhsths yparxei
                else if (choice == 4)
                {
                    Console.WriteLine("Name?");
                    string name = Console.ReadLine();
                    int results = 0;

                    for (int i = 0; i < entriesNumber; i++)
                    {
                        if (tester[i].name == name)
                        {
                            Console.WriteLine("{0}\t{1}", tester[i].name, tester[i].phone);
                            results++;
                        }

                        else if (tester[i].name != name)
                        {
                            Console.WriteLine("Please insert a valid entry");
                        }

                        Console.WriteLine("{0} results found", results);
                    }
                }

                else if (choice == 0)
                {
                    Console.WriteLine("Bye");
                }

                else
                {
                    Console.WriteLine("Wrong Input");
                }
            }
        }
    }
}