using System;

using System.Text.RegularExpressions;

using System.Diagnostics;

using System.Linq;

using System.Globalization;

public class Program

{

    private static Regex regex = new Regex("^-?[0-9]+(.[0-9]+)?$");

    public static void Main()

    {

        var target = "";

        Console.WriteLine($"target: {target}");

        Check3(target);

        Check4(target);

        target = "10";

        Console.WriteLine($"target: {target}");

        Check3(target);

        Check4(target);

        target = "10.0";

        Console.WriteLine($"target: {target}");

        Check3(target);

        Check4(target);

        target = "10.1";

        Console.WriteLine($"target: {target}");

        Check3(target);

        Check4(target);

        target = "0.0";

        Console.WriteLine($"target: {target}");

        Check3(target);

        Check4(target);

        target = "0.1";

        Console.WriteLine($"target: {target}");

        Check3(target);

        Check4(target);

        target = ".0";

        Console.WriteLine($"target: {target}");

        Check3(target);

        Check4(target);

        target = ".1";

        Console.WriteLine($"target: {target}");

        Check3(target);

        Check4(target);

        target = "FF";

        Console.WriteLine($"target: {target}");

        Check3(target);

        Check4(target);

        target = "0x10";

        Console.WriteLine($"target: {target}");

        Check3(target);

        Check4(target);

    }

    private static void Test(Action<string> a, string[] targets, string message) {

        Console.WriteLine($"start {message}");

        var sw = new Stopwatch();

        sw.Start();

        foreach(var target in targets) {

            a(target);

        }

        sw.Stop();

        Console.WriteLine($"end {message}: {sw.ElapsedMilliseconds}ms");

    }

    private static void Check1(string str) {

        if (double.TryParse(str, out var result)) {

            if (result % 1 > 0) {

                // Console.WriteLine("1-6200");

            } else {

                if (int.TryParse(result.ToString(), out var _)) {

                    // Console.WriteLine("Success");

                } else {

                    // Console.WriteLine("3-6400");

                }

            }

        } else {

            // Console.WriteLine("2-6400");

        }

    }

    private static void Check2(string str) {

        if (regex.IsMatch(str)) {

            if (int.TryParse(str, out var _)) {

                // Console.WriteLine("Success");

            } else {

                // Console.WriteLine("Parse Failed.");

            }

        } else {

            // Console.WriteLine("2-6400");

        }

    }

    private static void Check3(string str) {

                Console.WriteLine("  Default setting");

            if (int.TryParse(str, out var result)) {

                Console.WriteLine($"    int value.: {result}");

            } else {

                Console.WriteLine("    Parse Failed.");

            }

    }

    private static void Check4(string str) {

                Console.WriteLine("  Use NumberStyles.Number");

            if (int.TryParse(str, NumberStyles.Number, NumberFormatInfo.CurrentInfo, out var result)) {

                Console.WriteLine($"    int value.: {result}");

            } else {

                Console.WriteLine("    Parse Failed.");

            }

    }

}