//Guys 10 for 10, ok?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace UzhashnayaProga
{
    class Program
    {
        /// <summary>
        /// Create array MxN
        /// </summary>
        /// <param name="M">row</param>
        /// <param name="N">col</param>
        /// <param name="random"></param>
        /// <returns></returns>
        public static int[,] CreateArray(int M, int N, Random random)
        {
            if (M <= 0 || N <= 0) throw new Exception("Аргумент метода должен быть положительным!");
            int[,] Array = new int[M, N];
            for (int i = 0; i < M; i++)
                for (int j = 0; j < N; j++)
                    Array[i, j] = random.Next(0, 11);
            return Array;
        }
        /// <summary>
        /// Multiply matrixs
        /// </summary>
        /// <param name="A">The first one</param>
        /// <param name="B">The second</param>
        /// <param name="fl"></param>
        /// <returns></returns>
        public static int[,] MatrixMult(int[,] A, int[,] B, out bool fl)
        {
            int[,] C = new int[A.GetUpperBound(0)+1, B.GetUpperBound(1)+1];
            fl = false;
            if (A.GetUpperBound(1) != B.GetUpperBound(0))  return C;
            else
            {
                fl = true;
                for (int row = 0; row <= A.GetUpperBound(0); row++)
                    for (int col = 0; col <= B.GetUpperBound(1); col++)
                        for (int inner = 0; inner <= A.GetUpperBound(1); inner++)
                            C[row, col] += A[row, inner] * B[inner, col];
                return C;
            }
        }
        /// <summary>
        /// ...
        /// </summary>
        /// <param name="A"></param>
        /// <returns></returns>
        public static string MatrixToString(int[,] A)
        {
            string st = "";
            for (int row = 0; row <= A.GetUpperBound(0); row++)
            {
                for (int col = 0; col <= A.GetUpperBound(1); col++)
                    st += A[row, col].ToString() + " ";
                st += "\n";
            }
            return st;
        }
        /// <summary>
        /// String to int
        /// </summary>
        /// <param name="name"></param>
        /// <param name="num"></param>
        /// <returns></returns>
        public static int StrToInt(string name, string num)
        {
            int b;
            Console.WriteLine("Enter number of {0} in the {1} matrix.", name, num);
            while (!int.TryParse(Console.ReadLine(), out b))
                Console.WriteLine("Please enter number of {0} again.", name);
            return b;
        }
        /// <summary>
        /// Idk why i did it.
        /// </summary>
        private static void JustDoIt()
        {
            int M, N;
            bool fl;
            int[,] A, B,C;
            string a, b, c;
            do
            {
                Random random = new Random();
                try
                {
                    M = StrToInt("rows", "first");
                    N = StrToInt("columns", "first");
                    A = CreateArray(M, N, random);
                    M = StrToInt("rows", "second");
                    N = StrToInt("columns", "second");
                    B = CreateArray(M, N, random);
                    C = MatrixMult(A, B, out fl);
                    a = MatrixToString(A);
                    b = MatrixToString(B);

                }catch(Exception ex)
                {
                    Console.WriteLine(ex.Message);
                    Console.WriteLine("Press Esc to exit.");
                    continue;
                }
                if (fl)
                {
                    c = MatrixToString(C);
                    Console.WriteLine("Matrix A{0}{1}{0}Matrix B{0}{2}{0}AxB=C{0}Matrix C{0}{3}", "\n", a, b, c);
                }
                else
                    Console.WriteLine("Matrix A{0}{1}{0}Matrix B{0}{2}{0}Unfortunately, it is impossible to multiply matrix A and matrix B. :(", "\n", a, b);
                Console.WriteLine("Do you want to clear screen?\nPress Y if you want else press any other key.");
                if (Console.ReadKey().Key == ConsoleKey.Y) Console.Clear();
                Console.WriteLine();
                Console.WriteLine("Press Esc to exit.");
            } while (Console.ReadKey(true).Key != ConsoleKey.Escape);
        }
            static void Main()
        {
            JustDoIt();
        }
    }
}