Laba 8, case 5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            //Task 1 
            Random rnd = new Random();
            Console.Write("M:");
            int m = Convert.ToInt32(Console.ReadLine());
            Console.Write("N:");
            int n = Convert.ToInt32(Console.ReadLine());
            int[,] M = new int[m, n];
            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    M[i, j] = rnd.Next(9);
                }
            }
            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    Console.Write("{0} ", M[i, j]);
                }
                Console.WriteLine();
            }

            Console.Write("J:");
            int j2 = Convert.ToInt32(Console.ReadLine());
            j2--;
            for (int i = 0; i < m; i++)
            {
                M[j2, i] = M[j2, i] * 5;
            }


            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    Console.Write("{0} ", M[i, j]);
                }
                Console.WriteLine();
            }
            Console.WriteLine();
            
            //Task 2           
            Console.Write("M:");
            m = Convert.ToInt32(Console.ReadLine());
            Console.Write("N:");
            n = Convert.ToInt32(Console.ReadLine());
            int[,] M2 = new int[m, n];
            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    M2[i, j] = rnd.Next(9);
                }
            }
            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    Console.Write("{0} ", M2[i, j]);
                }
                Console.WriteLine();
            }
            int summ = 1;
            Console.WriteLine();
            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    summ = summ * M2[i, j];
                }
                Console.WriteLine(summ);
                summ = 1;
            }
            Console.WriteLine();

            //Task 3 
            Console.Write("M:");
            m = Convert.ToInt32(Console.ReadLine());
            Console.Write("N:");
            n = Convert.ToInt32(Console.ReadLine());
            int[,] M3 = new int[m, n];
            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    M3[i, j] = rnd.Next(9);
                }
            }
            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    Console.Write("{0} ", M3[i, j]);
                }
                Console.WriteLine();
            }
            Console.Write("K1:");
            int k1 = Convert.ToInt32(Console.ReadLine());
            k1--;
            Console.Write("K2:");
            int tmp;
            int k2 = Convert.ToInt32(Console.ReadLine());
            k2--;
            for (int i = 0; i < n; i++)
            {
                tmp = M3[k1, i];
                M3[k1, i] = M3[k2, i];
                M3[k2, i] = tmp;                              
            }
            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    Console.Write("{0} ", M3[i, j]);
                }
                Console.WriteLine();
            }
            Console.ReadLine();
        }
    }
}