using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

         /// <summary>

        /// Write a program and ask the user to enter a few numbers separated by a hyphen. Work out 

        /// if the numbers are consecutive. For example, if the input is "5-6-7-8-9" or "20-19-18-17-16", 

        /// display a message: "Consecutive"; otherwise, display "Not Consecutive".

        /// </summary>

        public void Exercise1()

        {

            Console.Write("Enter a few numbers (eg 1-2-3-4): ");

            var input = Console.ReadLine();

​

            var numbers = new List<int>();

            foreach (var number in input.Split('-'))

                numbers.Add(Convert.ToInt32(number));                

​

            numbers.Sort();

​

            var isConsecutive = true;

            for (var i = 1; i < numbers.Count; i++)

            {

                if (numbers[i] != numbers[i - 1] + 1)

                {

                    isConsecutive = false;

                    break;

                }

            }

​

            var message = isConsecutive ? "Consecutive" : "Not Consecutive";

            Console.WriteLine(message);

        }

​

        /// <summary>

        /// Write a program and ask the user to enter a few numbers separated by a hyphen. If the user simply 

        /// presses Enter without supplying an input, exit immediately; otherwise, check to see if there are 

        /// any duplicates. If so, display "Duplicate" on the console.

        /// </summary>

        public void Exercise2()

        {

            Console.Write("Enter a few numbers (eg 1-2-3-4): ");

            var input = Console.ReadLine();

​

            if (String.IsNullOrWhiteSpace(input))

                return;

​

            var numbers = new List<int>();

            foreach (var number in input.Split('-'))

                numbers.Add(Convert.ToInt32(number));

​

            var uniques = new List<int>();

            var includesDuplicates = false;

            foreach (var number in numbers)

            {

                if (!uniques.Contains(number))

                    uniques.Add(number);

                else

                {

                    includesDuplicates = true;

                    break;

                }

            }

​

            if (includesDuplicates)

                Console.WriteLine("Duplicate");

        }

​

        /// <summary>

        /// Write a program and ask the user to enter a time value in the 24-hour time format (e.g. 19:00).

        /// A valid time should be between 00:00 and 23:59. If the time is valid, display "Ok"; otherwise, 

        /// display "Invalid Time". If the user doesn't provide any values, consider it as invalid time. 

        /// </summary>

        public void Exercise3()

        {

            Console.Write("Enter time: ");

            var input = Console.ReadLine();

​

            if (String.IsNullOrWhiteSpace(input))

            {

                Console.WriteLine("Invalid Time");

                return;

            }

​

            var components = input.Split(':');

            if (components.Length != 2)

            {

                Console.WriteLine("Invalid Time");

                return;

            }

            try

            {

                var hour = Convert.ToInt32(components[0]);

                var minute = Convert.ToInt32(components[1]);

​

                if (hour >= 0 && hour <= 23 && minute >= 0 && minute <= 59)

                    Console.WriteLine("Ok");

                else

                    Console.WriteLine("Invalid Time");

            }

            catch (Exception)

            {

                Console.WriteLine("Invalid Time");

            }

        }

​

        /// <summary>

        /// Write a program and ask the user to enter a few words separated by a space. Use the words to 

        /// create a variable name with PascalCase convention. For example, if the user types: 

        /// "number of students", display "NumberOfStudents". Make sure the program is not dependent on 

        /// the casing of the input. So if the input is "NUMBER OF STUDENTS", it should still display 

        /// "NumberOfStudents". If the user doesn't supply any words, display "Error".

        /// </summary>

        public void Exercise4()

        {

            Console.Write("Enter a few words: ");

            var input = Console.ReadLine();

​

            if (String.IsNullOrWhiteSpace(input))

            {

                Console.WriteLine("Error");

                return;

            }

​

            var variableName = "";

            foreach (var word in input.Split(' '))

            {

                var wordWithPascalCase = char.ToUpper(word[0]) + word.ToLower().Substring(1);

                variableName += wordWithPascalCase;

            }

​

            Console.WriteLine(variableName);

        }

​

​

        /// <summary>

        /// Write a program and ask the user to enter an English word. Count the number of vowels 

        /// (a, e, o, u, i) in the word. So, if the user enters "inadequate", the program should display 

        /// 6 on the console. Make sure the program calculates the number of vowels irrespective of the 

        /// casing of the word (eg "Inadequate", "inadequate" and "INADEQUATE" all include 6 vowels).

        /// </summary>

        public void Exercise5()

        {

            Console.Write("Enter a word: ");

            // Note the ToLower() here. This is used to count for both A and a. 

            var input = Console.ReadLine().ToLower();

​

            var vowels = new List<char>(new char[] {'a', 'e', 'o', 'u', 'i'});

            var vowelsCount = 0;

            foreach (var character in input)

            {

                if (vowels.Contains(character))

                    vowelsCount++;

            }

​

            Console.WriteLine(vowelsCount);

    }

}