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  1. using System;
  2.  
  3. enum Rank { First, Second, High }
  4.  
  5. class License
  6. {
  7.     public string Organization { get; set; }
  8.     public string Qualification { get; set; }
  9.     public DateTime IssueDate { get; set; }
  10.  
  11.     public License(string org, string qual, DateTime date)
  12.     {
  13.         Organization = org;
  14.         Qualification = qual;
  15.         IssueDate = date;
  16.     }
  17.  
  18.     public License() : this("Default Org", "Default Qual", DateTime.Now) { }
  19.  
  20.     public override string ToString() => 
  21.         $"Org: {Organization}, Qual: {Qualification}, Date: {IssueDate:yyyy-MM-dd}";
  22. }
  23.  
  24. class Person
  25. {
  26.     public string FirstName { get; set; }
  27.     public string LastName { get; set; }
  28.  
  29.     public Person(string first, string last)
  30.     {
  31.         FirstName = first;
  32.         LastName = last;
  33.     }
  34.  
  35.     public Person() : this("John", "Doe") { }
  36.  
  37.     public override string ToString() => $"{FirstName} {LastName}";
  38. }
  39.  
  40. class StationWorker
  41. {
  42.     public Person Person { get; set; }
  43.     public string Specialization { get; set; }
  44.     public Rank Rank { get; set; }
  45.     public int Experience { get; set; }
  46.     public License[] Licenses { get; set; }
  47.  
  48.     public License FirstLicense
  49.     {
  50.         get
  51.         {
  52.             if (Licenses == null || Licenses.Length == 0) return null;
  53.  
  54.             License first = Licenses[0];
  55.             foreach (var license in Licenses)
  56.                 if (license.IssueDate < first.IssueDate)
  57.                     first = license;
  58.             return first;
  59.         }
  60.     }
  61.  
  62.     public StationWorker(Person person, string spec, Rank rank, int exp)
  63.     {
  64.         Person = person;
  65.         Specialization = spec;
  66.         Rank = rank;
  67.         Experience = exp;
  68.         Licenses = Array.Empty<License>();
  69.     }
  70.  
  71.     public StationWorker() : this(new Person(), "Mechanic", Rank.First, 0) { }
  72.  
  73.     public void AddLicense(params License[] newLicenses)
  74.     {
  75.         if (Licenses == null)
  76.         {
  77.             Licenses = newLicenses;
  78.             return;
  79.         }
  80.  
  81.         var combined = new License[Licenses.Length + newLicenses.Length];
  82.         Array.Copy(Licenses, combined, Licenses.Length);
  83.         Array.Copy(newLicenses, 0, combined, Licenses.Length, newLicenses.Length);
  84.         Licenses = combined;
  85.     }
  86.  
  87.     public override string ToString()
  88.     {
  89.         string result = $"Person: {Person}, Spec: {Specialization}, " +
  90.                        $"Rank: {Rank}, Exp: {Experience} years\nLicenses:\n";
  91.  
  92.         if (Licenses.Length > 0)
  93.             foreach (var license in Licenses)
  94.                 result += $"  {license}\n";
  95.         else
  96.             result += "  No licenses\n";
  97.  
  98.         return result;
  99.     }
  100.  
  101.     public virtual string ToShortString() => 
  102.         $"Person: {Person}, Spec: {Specialization}, Rank: {Rank}, Exp: {Experience} years";
  103. }
  104.  
  105. class Program
  106. {
  107.     static void Main()
  108.     {
  109.         // 1
  110.         var worker1 = new StationWorker();
  111.         Console.WriteLine("1. Конструктор без параметрів:");
  112.         Console.WriteLine(worker1.ToString());
  113.  
  114.         // 2
  115.         worker1.Person = new Person("Ivan", "Petrenko");
  116.         worker1.Specialization = "Engine Specialist";
  117.         worker1.Rank = Rank.High;
  118.         worker1.Experience = 5;
  119.         Console.WriteLine("\n2. Після зміни властивостей:");
  120.         Console.WriteLine(worker1.ToShortString());
  121.  
  122.         // 3
  123.         var worker2 = new StationWorker(
  124.             new Person("Maria", "Ivanova"), 
  125.             "Electric Systems", 
  126.             Rank.Second, 
  127.             3
  128.         );
  129.         Console.WriteLine("\n3. Конструктор з параметрами:");
  130.         Console.WriteLine(worker2.ToString());
  131.  
  132.         // 4
  133.         worker2.AddLicense(
  134.             new License("AutoTech", "Engine Repair", new DateTime(2020, 5, 15)),
  135.             new License("EVA", "EV Specialist", new DateTime(2022, 3, 10))
  136.         );
  137.         Console.WriteLine("4. Після додавання ліцензій:");
  138.         Console.WriteLine(worker2.ToString());
  139.  
  140.         // 5
  141.         Console.WriteLine("5. Перша ліцензія:");
  142.         Console.WriteLine(worker2.FirstLicense?.ToString() ?? "Ліцензії відсутні");
  143.     }
  144. }
Success #stdin #stdout 0.07s 30512KB
comments (?)
stdin 
Standard input is empty
stdout 
1. Конструктор без параметрів:
Person: John Doe, Spec: Mechanic, Rank: First, Exp: 0 years
Licenses:
  No licenses


2. Після зміни властивостей:
Person: Ivan Petrenko, Spec: Engine Specialist, Rank: High, Exp: 5 years

3. Конструктор з параметрами:
Person: Maria Ivanova, Spec: Electric Systems, Rank: Second, Exp: 3 years
Licenses:
  No licenses

4. Після додавання ліцензій:
Person: Maria Ivanova, Spec: Electric Systems, Rank: Second, Exp: 3 years
Licenses:
  Org: AutoTech, Qual: Engine Repair, Date: 2020-05-15
  Org: EVA, Qual: EV Specialist, Date: 2022-03-10

5. Перша ліцензія:
Org: AutoTech, Qual: Engine Repair, Date: 2020-05-15
https://ideone.com/XBFKGh
language:
C# (NET 6.0)
created:
4 days ago
visibility:
public

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