Programming

C# – Pascal Triangle

November 29, 2015

Problem: Create a program to create a pascal triangle by inputting a number to validate its size of the triangle.
Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int size;
            Console.Write("Pascal triangle size:");
            size = Int32.Parse(Console.ReadLine());
            printPascalTr(size);
            Console.ReadLine();
        }

        public static void printPascalTr(int size)
        {

            int[,] PascalTr = new int[size, size];
            int row, col;

            //assign zero to every array element

            for (row = 0; row < size; row++)
                for (col = 0; col < size; col++) PascalTr[row, col] = 0;

            //first and second rows are set to 1s   

            PascalTr[0, 0] = 1;
            PascalTr[1, 0] = 1;
            PascalTr[1, 1] = 1;

            for (row = 2; row < size; row++)
            {

                PascalTr[row, 0] = 1;

                for (col = 1; col <= row; col++)
                {
                    PascalTr[row, col] = PascalTr[row - 1, col - 1] + PascalTr[row - 1, col];
                }
            }

            //display the Pascal Triangle

            for (row = 0; row < size; row++)
            {

                for (col = 0; col <= row; col++)
                {

                    Console.Write("{0}\t", PascalTr[row, col]);

                }
                Console.WriteLine();
            }
        }
    }
}

Output:
Output

Output

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