//CORNILLEZ, JAZEL HANNE C.

//CCP 1103 - ITBC

//PASCAL'S TRIANGLE

​

using System;

public class Program

{

    public static void Main()

    {

        string inputRow;

        int input;

        int sumAboveRow = 0;

        int sumInRow = 0;

        int digitOne = 0;

        int digitTwo = 0;

        Console.WriteLine("Pascal's Triangle");

        Console.WriteLine();

        Console.Write("Enter a row number: ");

        inputRow = Console.ReadLine();

​

        if (Int32.TryParse(inputRow, out input) == true)

        {

            if (input > 25) 

            {

                Console.WriteLine("Number greater than 25 is not allowed.");

            }

            else if (input < 0) 

            {

                Console.WriteLine("Number less than zero is not allowed."); 

            }

            else if (input == 0) 

            {

                Console.WriteLine("The sum of numbers above row 0 is none. The sum of numbers in row 1 is 2."); 

            }

            else 

            {

                for (int i = 0; i < input; i++) 

                {

                    for (int n = 0; n <= i; n++) 

                    {

                        if (n == 0 || i == 0) 

                        {

                            digitOne = 1;

                            sumAboveRow += digitOne;

                        }     

                        else 

                        {

                            digitOne = digitOne * (i - n + 1) / n;

                            sumAboveRow += digitOne;

                        }

                    } 

                }

​

                for (int a = 0; a < input + 1; a++) 

                {

                    for (int e = 0; e <= a + 1; e++) 

                    {

                        if (e == 0 || a == 0) 

                        {

                            digitTwo = 1;

                            sumInRow += digitTwo;

                        }

                        else 

                        {

                            digitTwo = digitTwo * (a - e + 1) / e;

                            sumInRow += digitTwo;               

                        }

                    }

                }

                Console.WriteLine("The sum of numbers above row {0:#,0}", input + " is " + sumAboveRow + ". " + "The sum in row " + (input + 1) + " is " + sumInRow + ".");                     

            }

        }

        else 

        {

            Console.WriteLine("Invalid Input. Please enter a valid input.");

        }       

    }

}