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

public class Program {
    public static void Main(string[] args) {
        var sw = new Stopwatch();

        var array = new double[10000000];
        for (int i = 0; i < array.Length; i++) {
            array[i] = Math.Exp(12);
        }

        double tmp;

        {
            sw.Reset();
            sw.Start();
            
            for (int i = 0; i < array.Length; i++) {
                tmp = Math.Tanh(Math.Log(array[i]) / 7);
            }
            
            sw.Stop();
            Console.WriteLine("Loop using for: {0}ms", sw.Elapsed.TotalMilliseconds);
        }

        {
            sw.Reset();
            sw.Start();

            foreach(double d in array){
                tmp = Math.Tanh(Math.Log(d) / 7);
            }

            sw.Stop();
            Console.WriteLine("Loop using foreach: {0}ms", sw.Elapsed.TotalMilliseconds);
        }

    }
}