/// <summary>
/// удалить оценку
/// </summary>
/// <param name="subject"></param>
public static void DelMark(ISubject subject)
{
ShowMarks(subject);
if (subject.Count == 0)
{
return;
}
int index = EnterData("Choice mark to delete(index): ");
try
{
subject.DelMark(index - 1);
}
catch (MarkException exception)
{
WriteLine(exception.Message);
}
}