//===========================================================
// Class deconstructors
//===========================================================

using System;
using System.Collections.Generic;

class Student {
  public int Id {get; set;}
  public string FirstName {get; set;}
  public string LastName {get; set;}
  public string Field {get; set;}
  
  public Student(int Id, string FirstName, string LastName, string Field) {
    this.Id = Id;
    this.FirstName = FirstName;
    this.LastName = LastName;
    this.Field = Field;
  }
  
  public void Deconstruct(out int id, out string lastName) {
    id = this.Id;
    lastName = this.LastName;
  }
  
  public void Deconstruct(out int id, out string firstName, out string lastName) {
    id = this.Id;
    firstName = this.FirstName;
    lastName = this.LastName;
  }
}

public class A5 {
  
  public static void Main() {
    
    //--- Create a list of Students
    List students = new List {
      new Student(1855367, "John", "Doe", "Computing"),
      new Student(1855201, "Mary", "Miller", "Mathematics"),
      new Student(1855553, "Jane", "Jenkins", "Computing"),
      new Student(1855176, "Jeff", "Joplin", "Computing"),
      new Student(1855285, "Alex", "Adelson", "Mathematics")
    };
    
    //--- Print students using deconstructor 1
    foreach (Student student in students) {
      (int id, string lastName) = student;
      Console.WriteLine(id + ": " + lastName);
    }
    Console.WriteLine();
    
    //--- Print students using deconstructor 2
    foreach (Student student in students) {
      (int id, string firstName, string lastName) = student;
      Console.WriteLine(id + ": " + firstName + " " + lastName);
    }
  }
}