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(0.5 point) The public event OnNumberOfStudentChange that is raised when the number of students of the course changes (it means when adding or removing student).
With the main function given in Figure 1 below, your code must have the same result as the Figure 2.
(You can find this code in the Given Materials.)
150%
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static void Notify (int oldNumber, int newNumber)
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{
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Console.WriteLine($"Number of student has changed from {oldNumber} to {newNumber}.");
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}
O references
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static void Main(string[] args)
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{
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Student s = new Student(1, "Trung");
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Course c = new Course (1, "PRN211_Sum21");
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c.AddStudent(s, 7.5);
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c.AddStudent(new Student(2, "Hoa"), 7.8);
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c.AddStudent(new Student(3, "Vinh"), 7.4);Console.WriteLine(c);
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c.RemoveStudent(2);
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Console.WriteLine("\n---After remove:");
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Console.WriteLine(c);
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Console.WriteLine("\n----After add event handler:");
c.OnNumberOfStudentChange += Notify;
c.AddStudent(new Student(4, "Hoang Anh"), 8);
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c.RemoveStudent(1);
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Console.WriteLine(c);
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Console.ReadLine();
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}
Figure 1: Main function
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