using System;

public class Program

{

    // Requirements: 

    //  1. Write a loop to render as per output

    //  2. if else statement and additional variable is allowed

    public static void Main()

    {

        //Sum all the even numbers within N e.g: Input 10 Output: 30 

        Console.WriteLine("Please enter a number");

        int inputsum = 10;

        int total=0;

        for(int i=0; i<=inputsum;) {

            if(i % 2 ==0)

                total+=i;

            i+=2;

        }

        Console.WriteLine(total);

        int totaleven = inputsum/2;

        int sum = totaleven * (totaleven + 1);

        Console.WriteLine(sum);

        int input = 5;

        // ######################## Question 1 ###########################  

        //output:

        //*

        //**

        //***

        //****

        //*****

        Console.WriteLine("Question 1 output");

        for(int i=1; i<=input;)

        {

            for(int j=1; j<=i;)

            {

                Console.Write("*");

                j++;

            }

            Console.WriteLine("");

            i++; 

        }

        Console.WriteLine(new String('=', 50));

        // ######################## Question 2 ###########################  

        //output:

        //*****

        //****

        //***

        //**

        //*

        Console.WriteLine("Question 2 output");

        for(int i=1; i<=input;)

        {

            for(int j=input; j>=i;)

            {

                Console.Write("*");

                j--;

            }

            Console.WriteLine("");

            i++; 

        }

        Console.WriteLine(new String('=', 50));

        // ######################## Question 3 ###########################  

        //output:

        //    *

        //   **

        //  ***

        // ****

        //*****

        Console.WriteLine("Question 3 output");

        for(int i=1; i<=input;)

        {

            for(int k=5; k>i;)

                {

                    Console.Write(" ");

                     k--;

                }

            for(int j=1; j<=i;)

            {

                Console.Write("*");

                j++;

            }

            Console.WriteLine("");

            i++; 

        }

        for(int i=5; i>0;)

        {

            for(int j=1; j<=5;)

            {

                if( j >= i)

                Console.Write("*");

                else

                    Console.Write(" ");

                j++;

            }

            Console.WriteLine("");

            i--; 

        }

        Console.WriteLine(new String('=', 50));

        // ######################## Question 4 ###########################  

        //output:

        //*****

        // ****

        //  ***

        //   **

        //    *

        Console.WriteLine("Question 4 output");

        for(int i=1; i<=input;)

        {

            for(int j=input; j>=i;)

            {

                Console.Write("*");

                j--;

            }

            Console.WriteLine("");

            i++; 

        }

        Console.WriteLine(new String('=', 50));

        // ######################## Question 5 ###########################  

        //output:

        //*****

        //####

        //***

        //##

        //*

        Console.WriteLine("Question 5 output");

        for(int i=1; i<=input;)

        {

            for(int j=input; j>=i;)

            {

                if(i % 2 == 0)

                    Console.Write("#");

                else

                    Console.Write("*");

                j--;

            }

            Console.WriteLine("");

            i++; 

        }

        Console.WriteLine(new String('=', 50));

        // ######################## Question 6 ###########################  

        //output:

        //1

        //23

        //345

        //4567

        //56789

        Console.WriteLine("Question 6 output");

        for(int i=1; i<=input;)

        {

            for(int j=0; j<i;)

            {

                if(j == i)

                    Console.Write(i);

                else

                    Console.Write(i+j);

                j++;

            }

            Console.WriteLine("");

            i++; 

        }

        Console.WriteLine(new String('=', 50));

    }

}