using System;

public class Program

{

    public static void Main()

    {

        //1

        string s = "toller String";

        bool b = s.Contains("toll");

        Console.WriteLine(s.Contains("oll"));

        Console.WriteLine(b);

        //2

        string a = "toller String";

        a.CompareTo("oll");

        Console.WriteLine(s.CompareTo("lol"));

        //3

        int x = 123456789;

        int y = x.CompareTo(1);

        Console.WriteLine(x.CompareTo(123));

        Console.WriteLine(y);

        //4

        string up = "toller String";

        up = up.ToUpper();

        Console.WriteLine("to.up:" + up);

        //5

        string w = "ToLLer STriNG";

        w.ToLower();

        Console.WriteLine(w.ToLower());

        //6

        string e = "ToLLer STriNG";

        e.ToLowerInvariant();

        Console.WriteLine(e.ToLowerInvariant());

        //7

        string r = "ToLLer STriNG";

        r.Clone();

        Console.WriteLine(r.Clone());

        //8

        string t = "        ToLLer STriNG       ";

        t = t.Trim();

        Console.WriteLine("trim:" + t);

        //9

        string z = "ToLLer STriNG";

        z = z.Replace("L", "x");

        Console.WriteLine("replace.to:" +z);

        //10

        /*string u = "ToLLer STriNG";

        u.Remove("l");*/

​

        Console.WriteLine("Max: " + int.MaxValue);

        Math.

​

    }

}