Belov_HW_CS2

using System;
using System.Linq;

namespace Example
{
    class MyApplication
    {
        static Random rand = new Random();
        private static void First()
        {
            int[] first = new int[5];
            for (int i = 0; i < first.Length; i++)
            {
                first[i] = rand.Next(0, 10);
                Console.Write("{0} ", first[i]);
            }
            Console.WriteLine();
            int[] second = new int[5];
            for (int i = 0; i < first.Length; i++)
            {
                second[i] = rand.Next(0, 10);
                Console.Write("{0} ", second[i]);
            }
            Console.WriteLine();
            int[] result = new int[10];
            for (int i = 0; i < first.Length; i++)
            {
                result[i * 2] = first[i];
                result[i * 2 + 1] = second[i];
            }
            foreach (int item in result)
                Console.Write("{0} ", item);
            Console.ReadKey();
            Console.Clear();
        }
        private static void Second()
        {
            int[] first = new int[20];
            for (int i = 0; i < first.Length; i++)
            {
                first[i] = rand.Next(-10, 10);
                Console.Write("{0} ", first[i]);
            }
            Console.WriteLine();
            int[] second = new int[20];
            int secondIndex = 0;
            foreach (var item in first)
                if (item > 0)
                    second[secondIndex++] = item;
            foreach (var item in first)
                if (item == 0)
                    second[secondIndex++] = item;
            foreach (var item in first)
                if (item < 0)
                    second[secondIndex++] = item;
            foreach (int item in second)
                Console.Write("{0} ", item);
            Console.ReadKey();
            Console.Clear();
        }
        private static void Third()
        {
            int[,] array = new int[5, 5];
            for (int i = 0; i < 5; i++)
            {
                for (int j = 0; j < 5; j++)
                {
                    array[i, j] = rand.Next(-10, 40);
                    Console.Write("{0,3} ", array[i, j]);
                }
                Console.WriteLine();
            }
            bool negative = false;
            int sum = 0;
            for (int i = 0; i < 5; i++)
            {
                for (int j = 0; j < 5; j++)
                {
                    if (array[j, i] < 0)
                    {
                        negative = true;
                        break;
                    }
                    sum += array[j, i];
                }
                if (!negative)
                    Console.WriteLine("{0} - {1}", i, sum);
                sum = 0;
                negative = false;
            }
            Console.ReadKey();
            Console.Clear();
        }
        private static void Fourth()
        {
            int[,] array = new int[5, 5];
            for (int i = 0; i < 5; i++)
            {
                for (int j = 0; j < 5; j++)
                {
                    array[i, j] = rand.Next(-5, 5);
                    Console.Write("{0,3} ", array[i, j]);
                }
                Console.WriteLine();
            }
            int positives = 0;
            int zeros = 0;
            foreach (var item in array)
            {
                if (item > 0)
                    positives++;
                else if (item == 0)
                    zeros++;
            }
            Console.WriteLine("+ - {0}, 0 - {1}", positives, zeros);
        }
        public static void Main()
        {
            First();
            Second();
            Third();
            Fourth();
        }
    }
}