Floyd’s triangle is a right-angled triangular array of natural numbers, used in computer science education. It is named after Robert Floyd. It is defined by filling the rows of the triangle with consecutive numbers, starting with a 1 in the top left corner.

Source : http://en.wikipedia.org/wiki/Floyd’s_triangle

Code

        public static void PrintFloydTriangle(int rows)
        {
            int number = 1;
            for (int rowCounter = 0; rowCounter <= rows; rowCounter++)
            {
                for (int columnCounter = rowCounter; columnCounter >= 1; 
columnCounter--) { Console.Write(number++ + " "); } Console.WriteLine(""); } }
Test
Input : 6
Output


1

2 3

4 5 6

7 8 9 10

11 12 13 14 15

16 17 18 19 20 21

 

Input : 10


1

2 3

4 5 6

7 8 9 10

11 12 13 14 15

16 17 18 19 20 21

22 23 24 25 26 27 28

29 30 31 32 33 34 35 36

37 38 39 40 41 42 43 44 45

46 47 48 49 50 51 52 53 54 55