using System;
using static System.Console;
using static System.Math;
public static class main{

	public static string s = "class scope s";
	public static void print_s(){WriteLine(s);}

	public static void Main(){
		string s = "method scope s";
		print_s();
		WriteLine(s);
		{
			string ss="block scope";
			WriteLine(ss);
		}
	Write("hello from main\n");
	static_hello.print();
	static_world.print();
	static_hello.greeting="new hello from main\n";
	static_world.greeting="new world from main\n";
	static_hello.print();
	static_world.print();
	hello hello1 = new hello("hello1\n");
	hello world1 = new hello("world1\n");
	hello1.print();
	world1.print();
	hello another_hello = hello1;
	another_hello.greeting = "another greeting\n";
	hello1.print();
	hello test = new hello();
	test.print();
	Write($"the value of pi in Math is {System.Math.PI}\n");
	Write("the value of pi in Math is {0}\n",System.Math.PI);
	Write($"the value of e in Math is {System.Math.E}\n");
	double sqrt2 = Sqrt(2);
	Write($"sqrt2^2 = {Pow(sqrt2,2)}\n");
	Write($"1/2 = {1/2}\n");
	Write($"1.0/2 = {1.0/2}\n");
	}
}