Magic Square

MagicSquare

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MagicSquare
{
    class MagicSquare
    {
        static void Main()
        {
            int[,] matrix = {
                { 7, 12, 1, 14 }, 
                { 2, 13, 8, 11 }, 
                { 16, 3, 10, 5 },
                {  9, 6, 15, 4 },
            };
            bool isMagic = isMagicSquare(matrix);
            Console.WriteLine(isMagic);
        }

        private static bool isMagicSquare(int[,] matrix)
        {
            if (matrix.GetLength(0) != matrix.GetLength(1))
	        {
		        throw new ArgumentException("The matrix must be square.");
	        }

            int sum = 0;
            // Init the sum with the value of the sum of the first column
            for (int i = 0; i < matrix.GetLength(0); i++)
            {
                sum += matrix[i, 0];
            }

            // Calculate columns' sums
            for (int col = 1; col < matrix.GetLength(1); col++)
			{
                int currentColSum = 0;
                for (int row = 0; row < matrix.GetLength(0); row++)
                {
                    currentColSum += matrix[row, col];
                }
                if (currentColSum != sum)
                {
                    return false;
                }
			}

            // Calculate rows' sums
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                int currentRowSum = 0;
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    currentRowSum += matrix[row, col];
                }
                if (currentRowSum != sum)
                {
                    return false;
                }
            }

            // Calculate diagonals' sums
            int firstDiagonal = 0;
            int secondDiagonal = 0;
            for (int index = 0; index < matrix.GetLength(0); index++)
            {
                firstDiagonal += matrix[index, index];
                secondDiagonal += matrix[index, matrix.GetLength(0) - index - 1];
            }
            if (firstDiagonal != sum || secondDiagonal != sum)
            {
                return false;
            }

            return true;
        }
    }
}