using System;

namespace Test
{
    public class T
    {
        public static void MultiplyMatrix()
        {
            Random ran = new Random();
            int[,] a = new int[4, 5];
            // Инициализируем данный массив
            for (int i = 0; i < a.GetLength(0); i++)
            {
                for (int j = 0; j < a.GetLength(1); j++)
                {
                    a[i, j] = ran.Next(1, 15);
                }
            }
            int[,] b = new int[5, 4];
            // Инициализируем данный массив
            for (int i = 0; i < b.GetLength(0); i++)
            {
                for (int j = 0; j < b.GetLength(1); j++)
                {
                    b[i, j] = ran.Next(1, 15);
                }
            }

            int[,] c = new int[a.GetLength(0), b.GetLength(1)];
            if (a.GetLength(1) == b.GetLength(0))
            {

                for (int i = 0; i < a.GetLength(0); i++)
                {
                    for (int j = 0; j < b.GetLength(1); j++)
                    {
                        for (int k = 0; k < b.GetLength(0); k++)
                        {
                            c[i, j] += a[i, k] * b[k, j];
                        }
                    }
                }
            }
            else
            {
                Console.WriteLine(
                    "\n Number of columns in First Matrix should be equal to Number of rows in Second Matrix.");
                Console.WriteLine("\n Please re-enter correct dimensions.");
                Environment.Exit(-1);
            }
            for (int i = 0; i < c.GetLength(0); i++)
            {
                for (int j = 0; j < c.GetLength(1); j++)
                {
                    Console.Write("C[{0},{1}] : {2}", i, j, c[i, j]);
                }
                Console.WriteLine();
            }
        }

        public static void Main()
        {
            MultiplyMatrix();
        }
    }
}