Fill The Matrix Example

namespace FillTheMatrix
{
    using System;

    /// <summary>
    /// Problem 1. Fill the matrix
    /// Write a program that fills and prints a matrix of size `(n, n)` as shown below:
    /// </summary>
    public class FillTheMatrix
    {
        public static void Main()
        {
        int n = 4;
            int[,] matrix = new int[n, n];

            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    // 1   2   3   4
                    // 5   6   7   8
                    // 9   10  11  12
                // 13  14  15  16
                    // matrix[row, col] = row * n + col + 1;

            // swicth row and col and you'll get:
                    // 1  5  9   13
                // 2  6  10  14
                // 3  7  11  15
                // 4  8  12  16
                    matrix[col, row] = row * n + col + 1;

            // alternative way:
                    // matrix[row, col] = row + col * n + 1;
                }
            }
        }

        public static void PrintMatrix(int[,] matrix)
        {
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    Console.Write("{0,3}", matrix[row, col]);
                }

                Console.WriteLine();
            }
        }
    }
}