377

using System;
using System.Text;
namespace ExamTasks
{
    class Program
    {
        static void Main(string[] args)
        {
            Random rnd = new Random();
            int n = 12;
            double[,] matrix = new double[n, n];
            for (int i = 0; i < n; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    matrix[i, j] = rnd.Next(0, 10);
                    Console.Write(matrix[i, j] + "\t");
                }
                Console.WriteLine("");
            }
            for (int i = 0; i < n; i++)
                for (int j = i; j < n; j++)
                    matrix[i, j] = 0;
            Console.WriteLine("");
            for (int i = 0; i < n; i++)
            {
                for (int j = 0; j < n; j++)
                    Console.Write(matrix[i, j] + "\t");
                Console.WriteLine("");
            }
        }
    }
}