public static void Main()
Console.Write("Introdueix la mida de l'array (M): ");
int M = int.Parse(Console.ReadLine());
int[,] matriu = new int[M, M];
for (int i = 0; i < M; i++)
for (int j = 0; j < M; j++)
Console.WriteLine("\nArray:");
for (int i = 0; i < M; i++)
for (int j = 0; j < M; j++)
Console.Write(matriu[i, j] + "\t");
for (int i = 0; i < M; i++) sumaDiagonal += matriu[i, i];
Console.WriteLine("\nSuma de la diagonal major: " + sumaDiagonal);