using System;

    class Student

        {

            public string FirstName { get; set; }

            public string LastName { get; set; }

            public int Age { get; set; }

            public int Rate { get; set; }

            public Student(string firstName, string lastName, int age, int rate)

            {

                FirstName = firstName;

                LastName = lastName;

                Age = age;

                Rate = rate;

            }

​

                public string GetRateAsText()

                {

                    if (Rate >= 85 && Rate == 100)

                        return "Відмінно";

                    else if (Rate >= 75 && Rate <= 84)

                        return "Добре";

                    else if (Rate >= 55 && Rate <= 74)

                        return "Задовільно";

                    else if (Rate >= 1 && Rate <= 54 )

                        return "Незадовільно";

                    else

                        return "";

                }

        }

​

            class Program

        {

            static void Main(string[] args)

        {

        var studentPetro = new Student("Петро", "Васін", 14, 100);

        var studentMariya = new Student("Марічка", "Гуц", 12, 55);

        var studentVasil = new Student("Василь", "Сидоренко", 15, 20);

​

        Student [] arr = new Student [] { studentPetro, studentMariya, studentVasil };

​

        Console.WriteLine("| П.І.Б. учня  | Вік | Оцінка |");

        foreach (var student in arr)

        {

            string fullName = $"{student.FirstName} {student.LastName}";

            string rateText = student.GetRateAsText();

            Console.WriteLine("| {0} | {1} | {2} |", fullName, student.Age, rateText);

        }

    }

}