using System;

​

public class Program {

    private static void Task1(){

        Console.WriteLine("==== Task 1 ==== \n");

        Console.Write("Enter 1-100 number: ");

        int num = Convert.ToInt32(Console.ReadLine());

        if(num > 1 && num < 100){

            if(num % 3 == 0 && num % 5 == 0)

                Console.WriteLine("Fizz Buzz");

            else if (num % 3 == 0)

                Console.WriteLine("Fizz");

            else if (num % 5 == 0)

                Console.WriteLine("Buzz");

            else

                Console.WriteLine(num);

        }

        else

            Console.WriteLine("Error");

    }

    private static void Task2(){

        Console.WriteLine("\n\n ==== Task 2 ==== \n");

        Console.Write("Number: ");

        double num = Convert.ToInt32(Console.ReadLine());

        Console.Write("Percent: ");

        double percent = Convert.ToInt32(Console.ReadLine());

        Console.Write("{0}% from {1} is {2}", percent, num, (num * percent) / 100);

    }

    private static void Task3(){

        Console.WriteLine("\n\n ==== Task 3 ==== \n");

        int res = 0;

        for(int i = 1000, j = 0; j < 4; i /= 10, j++){

            Console.Write("Enter number {0}: ", j + 1);

            res += (Convert.ToInt32(Console.ReadLine()) * i);

        }

        Console.Write("Result: " + res);

    }

    private static void Task4(){

        Console.WriteLine("\n\n ==== Task 4 ==== \n");

        Console.Write("Enter 6-digit number: ");

        int num = Convert.ToInt32(Console.ReadLine());

        if(num / 100000 > 0 && num / 100000 < 10){

            Console.Write("Enter 1 position to change: ");

            int pos1 = Convert.ToInt32(Console.ReadLine());

            Console.Write("Enter 2 postition: ");

            int pos2 = Convert.ToInt32(Console.ReadLine());

            Console.Write("\nOld version: " + num);

            int[] arr = {(num / 100000), ((num % 100000) / 10000), ((num % 10000) / 1000), ((num % 1000) / 100), ((num % 100) / 10), (num % 10)};

            int temp = arr[pos1 - 1];

            arr[pos1 - 1] = arr[pos2 - 1];

            arr[pos2 - 1] = temp;

            int res = 0;

            for(int i = 0, j = 100000; i < 6; j /= 10, i++){

                res += arr[i] * j;

            }

            Console.Write("\nNew version: " + res);

        }

    }

    private static void Task5(){

        Console.WriteLine("\n\n ==== Task 5 ==== \n");

        Console.Write("Enter date:");

        string date = Console.ReadLine();

        string[] dateArr = date.Split('.');

        DateTime dt = new DateTime(Convert.ToInt32(dateArr[2]), Convert.ToInt32(dateArr[1]), Convert.ToInt32(dateArr[0]));

        string season = "Autumn";

        if(dt.Month == 12 || dt.Month == 1 || dt.Month == 2)

            season = "Winter";

        else if(dt.Month >= 3 && dt.Month <= 5)

            season = "Spring";

        else if(dt.Month >= 6 && dt.Month <= 8)

            season = "Summer";

        Console.WriteLine("{0} {1}", season, dt.DayOfWeek);

    }

    private static void Task6(){

        Console.WriteLine("\n\n ==== Task 6 ==== \n");

        Console.Write("Enter temperature: ");

        double temperature = Convert.ToDouble(Console.ReadLine());

        Console.Write("Is this C(Celcius) or F(Farenheit): ");

        char type = Convert.ToChar(Console.ReadLine());

        if(type == 'F'){

            Console.WriteLine("F - " + temperature + "°");

            temperature = (temperature - 32) * 5 / 9;

            Console.WriteLine("C - " + temperature + "°");

        }

        else if(type == 'C'){

            Console.WriteLine("C - " + temperature + "°");

            temperature = (temperature * 9 / 5) + 32;

            Console.WriteLine("F - " + temperature + "°");

        }

    }

    private static void Task7(){

        Console.WriteLine("\n\n ==== Task 7 ==== \n");

        Console.Write("Enter 1 position: ");

        int pos1 = Convert.ToInt32(Console.ReadLine());

        Console.Write("Enter 2 position: ");

        int pos2 = Convert.ToInt32(Console.ReadLine());

        if(pos2 < pos1){

            int temp = pos1;

            pos1 = pos2;

            pos2 = temp;

        }

        for(int i = pos1; i <= pos2; i++)

            if(i % 2 == 0)

                Console.Write("{0} ", i);

    }

    public static void Main() {

        Task1();

        Task2();

        Task3();

        Task4();

        Task5();

        Task6();

        Task7();

    }

}