edit

Author: kallyy7

08.Objects and Classes/Exercises/01.CountWorkingDays/CountWorkingDays.cs

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+using System;
+using System.Globalization;
+using System.Linq;
+
+public class CountWorkingDays
+{
+    public static void Main()
+    {
+        DateTime[] holidays =
+        {
+                new DateTime(4, 1, 1),
+                new DateTime(4, 3, 3),
+                new DateTime(4, 5, 1),
+                new DateTime(4, 5, 6),
+                new DateTime(4, 5, 24),
+                new DateTime(4, 9, 6),
+                new DateTime(4, 9, 22),
+                new DateTime(4, 11, 1),
+                new DateTime(4, 12, 24),
+                new DateTime(4, 12, 25),
+                new DateTime(4, 12, 26)
+        };
+
+        DateTime startDay = DateTime.ParseExact(Console.ReadLine(), "dd-MM-yyyy", CultureInfo.InvariantCulture);
+        DateTime endDay = DateTime.ParseExact(Console.ReadLine(), "dd-MM-yyyy", CultureInfo.InvariantCulture);
+        int counter = 0;
+
+        for (DateTime day = startDay; day <= endDay; day = day.AddDays(1))
+        {
+            if (day.DayOfWeek == DayOfWeek.Saturday || day.DayOfWeek == DayOfWeek.Sunday)
+            {
+                continue;
+            }
+            DateTime current = new DateTime(4, day.Month, day.Day);
+
+            if (holidays.Contains(current) == false)
+            {
+                counter++;
+            }
+
+        }
+
+        Console.WriteLine(counter);
+    }
+}

08.Objects and Classes/Exercises/01.CountWorkingDays/Program.cs

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+using System;
+
+public class AdvertisementMessage
+{
+    public static void Main()
+    {
+        int countOfAdvertisements = int.Parse(Console.ReadLine());
+
+        string[] phrases = 
+        {
+            "Excellent product.",
+            "Such a great product.",
+            "I always use that product.",
+            "Best product of its category.",
+            "Exceptional product.",
+            "I can’t live without this product."
+        };
+        string[] events = 
+        {
+            "Now I feel good.",
+            "I have succeeded with this product.",
+            "Makes miracles.I am happy of the results!",
+            "I cannot believe but now I feel awesome.",
+            "Try it yourself, I am very satisfied.",
+            "I feel great!"
+        };
+
+        string[] authors =
+        {
+            "Diana",
+            "Petya",
+            "Stella",
+            "Elena",
+            "Katya",
+            "Iva",
+            "Annie",
+            "Eva"
+        };
+        string[] cities =
+        {
+            "Burgas",
+            "Sofia",
+            "Plovdiv",
+            "Varna",
+            "Ruse"
+        };
+        Random randomAdv = new Random();
+
+        for (int i = 0; i < countOfAdvertisements; i++)
+        {
+            string phrase = phrases[randomAdv.Next(0, phrases.Length)];
+            string eventa = events[randomAdv.Next(0, events.Length)];
+            string author = authors[randomAdv.Next(0, authors.Length)];
+            string city = cities[randomAdv.Next(0, cities.Length)];
+
+            Console.WriteLine("{0} {1} {2} - {3}", phrase, eventa, author, city);
+        }
+    }
+}

08.Objects and Classes/Exercises/02.AdvertismentMessage/AdvertisementMessage.cs

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+using System;
+using System.Linq;
+
+public class IntersectionOfCircles
+{
+    public static void Main()
+    {
+        Circle circle1 = ReadCircle(Console.ReadLine());
+        Circle circle2 = ReadCircle(Console.ReadLine());
+
+        int deltaX = circle1.Center.X - circle2.Center.X;
+        int deltaY = circle1.Center.Y - circle2.Center.Y;
+        double distanceBetweenCenters = Math.Sqrt(deltaX * deltaX + deltaY * deltaY);
+
+        if (distanceBetweenCenters > circle1.Radius + circle2.Radius)
+        {
+            Console.WriteLine("No");
+        }
+        else
+        {
+            Console.WriteLine("Yes");
+        }
+    }
+
+    private static Circle ReadCircle(string input)
+    {
+        int[] tokens = input.Split(' ').Select(int.Parse).ToArray();
+        return new Circle { Center = new Point { X = tokens[0], Y = tokens[1] }, Radius = tokens[2] };
+    }
+}
+
+public class Point
+{
+    public int X { get; set; }
+    public int Y { get; set; }
+}
+
+public class Circle
+{
+    public Point Center { get; set; }
+    public int Radius { get; set; }
+}

08.Objects and Classes/Exercises/02.AdvertismentMessage/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+public class AverageGrades
+{
+    public static void Main()
+    {
+        int studentsCount = int.Parse(Console.ReadLine());
+
+        Student[] students = new Student[studentsCount];
+
+        for (int i = 0; i < studentsCount; i++)
+        {
+            students[i] = ReadStudent(Console.ReadLine());
+        }
+
+        foreach (Student student in students.Where(x => x.AverageGrade >= 5).OrderBy(x => x.Name).ThenByDescending(x => x.AverageGrade))
+        {
+            Console.WriteLine("{0} -> {1:F2}", student.Name, student.AverageGrade);
+        }
+    }
+
+    private static Student ReadStudent(string input)
+    {
+        string[] tokens = input.Split(' ');
+        List<double> grades = new List<double>();
+        foreach (string token in tokens.Skip(1))
+        {
+            grades.Add(double.Parse(token));
+        }
+
+        return new Student { Name = tokens[0], Grades = grades };
+    }
+}
+
+public class Student
+{
+    public string Name { get; set; }
+    public List<double> Grades { get; set; }
+    public double AverageGrade => Grades.Sum() / Grades.Count; 
+}