using System;

//using System.Linq;

//using System.Collections.Generic;

​

namespace Checkpoint1

{

public class Program

{

    public static void Main()

    {

        Checkpoint1_1();

        Checkpoint1_2();

        Checkpoint1_3();

        Checkpoint1_4();

        Checkpoint1_5();

    }

        // 1.1 Write a program to count how many numbers between 1 and 100 are 

        // divisible by 3 with no remainder. Display the count on the console.

        public static void Checkpoint1_1()

        {

            Console.WriteLine("{0,50}", "*********** Checkpoint 1.1 ************");

            int total = 0;

            for (int i = 1; i <= 100; i++)      

            if  (i % 3 == 0)

            {

                Console.WriteLine(i);

                total++;

            }

            {

                Console.WriteLine("There are {0} numbers between 1 and 100 that are divisible by 3 with no remainder.\n", total);

            }

        }       

        //1.2 Write a program and continuously ask the user to enter a number 

        // or "ok" to exit. Calculate the sum of all the previously entered

        // numbers and display it on the console.

        public static void Checkpoint1_2()

        {

            Console.WriteLine("{0,50}", "*********** Checkpoint 1.2 ************\n");

            bool exit = true;

            long sum = 0;  

            Console.WriteLine("Please enter a number and I will calculate the SUM of all entered numbers.\n");

            Console.WriteLine("Or enter OK to exit");

​

            while(exit)

            {

                string i = Console.ReadLine().ToLower();

                if ( i == "ok")

                {

                    Console.WriteLine("---------- That is all! ------------\n"); 

                    exit = false;

                    break;

                }

                sum += Convert.ToInt64(i);

                Console.WriteLine("\n\tThe Sum of all entered numbers is {0}.\n", sum);            

             } 

        }

        //1.3 Write a program and ask the user to enter a number. 

        //Compute the factorial of the number and print it on the console. 

        //For example, if the user enters 5, the program should calculate 5 x 4 x 3 x 2 x 1 

        //and display it as 5! = 120.

        public static void Checkpoint1_3()

        {

            Console.WriteLine("{0,50}", "*********** Checkpoint 1.3 ************\n");

            Console.WriteLine("Please enter your factorial number between 1 and 100 = ");

            double factorial = double.Parse(Console.ReadLine());

            double result = 1;

            while (true)

            {

                Console.Write(factorial);

                if (factorial == 1)

                {

                    break;

                }

            Console.Write(" * ");

            result *= factorial;

            factorial--;

            }

            Console.WriteLine(" = {0}", result);

            Console.WriteLine("Factorial of your number! = {0}.\n", result);

        }

​

        // 1.4 Write a program that picks a random number between 1 and 10. 

        // Give the user 4 chances to guess the number. 

        // If the user guesses the number, display “You won"; otherwise, display “You lost". 

        // (To make sure the program is behaving correctly, you can 

        // display the secret number on the console first.) 

        public static void Checkpoint1_4()

        {

            Console.WriteLine("{0,50}", "*********** Checkpoint 1.4 ************\n");

            Console.WriteLine("Please enter a number between 1 and 10.");

            Console.WriteLine("You have 4 chances to guess the secret number.");

            int randomInteger = Getting_Random();

            Attempts(randomInteger);

        }

        private static int Getting_Random()

        {

            var random = new Random();

            return random.Next(1, 10);

        }

​

         public static void Attempts(int randomInteger)

            {

                for (int i = 1; i <= 4; i++)

                {

                    Console.Write("\n\tThe {0} attempt: ", i);

                    int input = int.Parse(Console.ReadLine());

                    //Console.WriteLine("You have entered the number: {0}", input); 

                    if (input == randomInteger ) 

                    {

                        Console.WriteLine("\t\nYou have won! The secret number is {0}.\n", randomInteger);

                        break;

                    }

                    if (ChancesToWin(i))

                    {

                        Console.WriteLine("You lost. The secret number was {0}.", randomInteger);   

                        break;

                    }

                    Console.Write("Nope. Try again.\n");

                }

            }

         private static bool ChancesToWin(int i)

         {

            return i == 4;          

         }

​

        // 1.5 Write a program and ask the user to enter a series of numbers 

        // separated by comma. Find the maximum of the numbers and  

        // display it on the console. For example, if the user enters 

        //“5, 3, 8, 1, 4", the program should display 8.

        public static void Checkpoint1_5()

        {

            Console.WriteLine("\n{0,50}", "*********** Checkpoint 1.5 ************\n");

            Console.WriteLine("Enter a numbers separated by a space:");

​

        int greatest = 0;

        string[] bunchOfNumbers = Console.ReadLine().Split(' ');

        int[] nums = Array.ConvertAll(bunchOfNumbers, int.Parse);

​

        foreach (int num in nums)

        {

            if (num > greatest)

            {

                 greatest = num;

            }

        }

        Console.WriteLine("{0} - is the greatest number.", greatest);   

        Console.WriteLine("\n\t\t************Thanks!************\n");

        }

    }

}

​