school/School/Z1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace School
{
    abstract class AbstractClass
    {
        public abstract int CountSkip(int CountWorkDays); //Для посчета пропусков
        public abstract double AvgRating(int CountRating); //Для посчета среднего бала
        public abstract void ReadDiary(); // Для прочтения дневника
    }
    class BaseClass : AbstractClass
    {
        protected int CountSkips;
        protected double AvgRatings;
        protected int[] ArraySkip;
        protected int[] ArrayRating;
        public override int CountSkip(int CountWorkDays)
        {
            ArraySkip = new int[CountWorkDays];
            for (int i = 0; i < CountWorkDays - 1; i++)
            {
                if (ArraySkip[i] == 0)
                {
                    CountSkips++;
                }
            }
            return CountSkips;
        }

        public override double AvgRating(int CountRating)
        {
            ArrayRating = new int[CountRating];
            AvgRatings = ArrayRating.Average();
            return AvgRatings;
        }

        public override void ReadDiary()
        {
            if (ArraySkip != null || ArrayRating != null)
            {
                Console.WriteLine("Пропуски");
                Console.WriteLine("Всего: " + CountSkips);
                Console.WriteLine("По дням: ");
                for (int i = 0; i < ArraySkip.Length; i++)
                {
                    if (ArraySkip[i] == 0)
                    {
                        Console.WriteLine(i + 1 + " ");
                    }
                }
                Console.WriteLine("Оценки");
                Console.WriteLine("Средний бал: " + AvgRatings);
                Console.WriteLine("По дням: ");
                for (int i = 0; i < ArrayRating.Length; i++)
                {
                    if (ArraySkip[i] != 0)
                    {
                        Console.WriteLine(i + 1 + " день оценка " + ArrayRating[i]);
                    }
                }
            }
            else
            {
                Console.WriteLine("Дневник пуст");
            }

                
            
        }
    }

    class DerivedClass : BaseClass
    {
        public new int CountSkip(int CountWorkDays)
        {
            ArraySkip = new int[CountWorkDays];
            for (int i = 0; i < ArraySkip.Length; i++)
            {
                Console.WriteLine("Был ли ученик в " + (i + 1) + " день учебы? ( 1 - да / 0 - нет )");
                ArraySkip[i] = Convert.ToInt32(Console.ReadLine());
                if (ArraySkip[i] == 0)
                {
                    CountSkips++;
                }
            }
            return CountSkips;
        }
        public override double AvgRating(int CountRating)
        {
            ArrayRating = new int[CountRating];
            for (int i = 0; i < ArrayRating.Length; i++)
            {
                Console.WriteLine("Какая оценка стоит у ученка  в " + (i + 1) + " день учебы? ( 2,3,4,5 - оценка / 0 - нет оценки )");
                ArrayRating[i] = Convert.ToInt32(Console.ReadLine());
            }
            AvgRatings = ArrayRating.Average();
            return AvgRatings;
        }
        public void Eror()
        {
            if (ArraySkip != null || ArrayRating != null)
            {
                for (int i = 0; i < ArraySkip.Length; i++)
                {
                    if (ArraySkip[i] == 0 && ArrayRating[i] != 0)
                    {
                        Console.WriteLine("Ошибка: В " + i + "  день ученика не было в школеа а оценка стоит!");
                    }
                }
            }
            else { Console.WriteLine("Дневник пуст");}
        }

    }
}