C# Task17

Program.cs

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

namespace Task17_cs
{
    class Program
    {
        const int arraySize = 20000;
        const int matrixSize = 600;
        static void Main(string[] args)
        {
            testA();
            testB();
            testC();
            Console.ReadLine();
        }

        private static void testC()
        {
            Console.WriteLine("Test C");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Random r = new Random();
            double[,] a = new double[matrixSize, matrixSize];
            double[,] b = new double[matrixSize, matrixSize];
            double[,] c = new double[matrixSize, matrixSize];
            for (int i = 0; i < matrixSize; i++)
                for (int j = 0; j < matrixSize; j++)
                {
                    a[i, j] = r.NextDouble() / 10 + 1;
                    b[i, j] = r.NextDouble() / 10 + 1;
                }
            for (int i = 0; i < matrixSize; i++)
                for (int j = 0; j < matrixSize; j++)
                    for (int k = 0; k < matrixSize; k++)
                        c[i, j] += a[i, k] * b[k, j];
            sw.Stop();
            Console.WriteLine("Consumed time: {0}", sw.Elapsed);
        }

        private static void testB()
        {
            Console.WriteLine("Test B");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Random r = new Random();
            double[] a = new double[arraySize];
            for (int i = 0; i < arraySize; i++)
                a[i] = r.NextDouble() / 10 + 1;
            double sum = 0;
            for (int i = 0; i < arraySize; i++)
                for (int j = 0; j < arraySize; j++)
                    sum += 1 / (a[i] * a[j]);
            sw.Stop();
            Console.WriteLine("Result: {0}, Consumed time: {1}", sum, sw.Elapsed);
        }

        private static void testA()
        {
            Console.WriteLine("Task A");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            double sum = 0;
            for (int i = 1; i <= arraySize; i++)
                for (int j = 1; j <= arraySize; j++)
                    sum += 1.0 / (i * j);
            sw.Stop();
            Console.WriteLine("Result: {0}, Consumed time: {1}", sum, sw.Elapsed);
        }
    }
}