using System;

public class Program

{

    public static void Main()

    {

var Iryna = new Student()

     {

    FirstName = "Iryna",

    LastName = "Ihnat",

    Age = 14 ,

    Rate = 78

     } ;

var Dima = new Student()

     {

    FirstName = "Dima",

    LastName = "Kotr",

    Age = 16 ,

    Rate = 97

     } ;

var Lol = new Student()

     {

    FirstName = "Lol",

    LastName = "Tolr",

    Age = 11,

    Rate = 23

     } ; 

Student[] arr = new Student[] {Iryna, Dima,  Lol};

    foreach  (var item in arr)

        {

string rating = "";

    if(item.rate > 85 && item.rate < 100)

        {

        rating = "Відмінно";

        }

        else if(item.rate > 75 && item.rate < 84)

            {

        rating = "Добре";

            }

        else if (item.rate > 55 && item.rate < 74)

            {

        rating = "Задовільно";

            }

        else if (item.rate > 0 && item.rate < 54)

            {

        rating = "Незадовільно";

            }

Console.WriteLine("Ім'я {0} років{1}, {2}, оцінка{3}", item.FirstName, item.LastName, item.age, rating);

Console.WriteLine("================================================");

        }

    }

}

​