static void Main(string[] args)
{
List <Student> studentList = new List <Student>();
Student student = new Student();
bool exit = false;
do
{
string input = Message.DisplayMenu();
if (input == "1")
{
Add.AddStudent(student, studentList);
}
else if (input == "2")
{
Grade.Avrg(studentList);
}
else if (input == "3")
{
exit = true;
}
else
{
Message.DisplayError();
}
} while (exit == false);
}
