static void Main()
{
#region Single Responsability Principle
var homework = new Homework();
homework.AddEntry(new Task(Discipline.Math, new DateTime(2019, 1, 1), "Solve the equation: x^2 + 2x + 8"));
homework.AddEntry(new Task(Discipline.History, new DateTime(2019, 1, 3), "Research of the World War II"));
homework.AddEntry(new Task(Discipline.English, new DateTime(2019, 2, 3), "An essay about the film industry"));
Console.WriteLine(homework.ToString());
Console.WriteLine();
homework.RemoveEntry(1);
Console.WriteLine(homework.ToString());
Console.WriteLine();
FileSaver.SaveToFile("Homeworks", "homework.txt", homework);
Console.WriteLine("Homework saved to file!");
Console.WriteLine();
var schedule = new Schedule();
schedule.AddEntry(new Appointment(new DateTime(2019, 2, 1), new TimeSpan(0, 30, 0), "Hospital", "Medical Check up"));
schedule.AddEntry(new Appointment(new DateTime(2019, 2, 5), new TimeSpan(2, 15, 0), "Sports Club", "Soccer Match"));
Console.WriteLine(schedule.ToString());
Console.WriteLine();
FileSaver.SaveToFile("Schedules", "schedule.txt", schedule);
Console.WriteLine("Schedule saved to file!");
Console.WriteLine();
#endregion
}