Programa C# para mostrar la matriz triangular superior

using System;

class UpperTriangularMatrix
{
    static void Main(string[] args)
    {
        Console.WriteLine("Upper Triangular Matrix Display");
        Console.WriteLine("--------------------------------");

        // Input the matrix size
        Console.Write("Enter the size of the matrix: ");
        int size = int.Parse(Console.ReadLine());

        int[,] matrix = new int[size, size];

        // Input the matrix elements
        Console.WriteLine("Enter the matrix elements:");
        for (int i = 0; i < size; i++)
        {
            for (int j = 0; j < size; j++)
            {
                if (j >= i)
                {
                    Console.Write($"Enter element at position [{i},{j}]: ");
                    matrix[i, j] = int.Parse(Console.ReadLine());
                }
                else
                {
                    matrix[i, j] = 0;
                }
            }
        }

        // Display the upper triangular matrix
        Console.WriteLine("\nUpper Triangular Matrix:");
        for (int i = 0; i < size; i++)
        {
            for (int j = 0; j < size; j++)
            {
                Console.Write(matrix[i, j] + " ");
            }
            Console.WriteLine();
        }
    }
}