//demonstrate block scope
class scope
{
	public static void main(String[] args)
	{
		int x = 10;
		
		if(x == 10)
		{
			int y = 20;
			
			System.out.println("x and y: " + x + " " + y);
			
			x = y * 2;
		}
		
		//y = 100;//Eorror! y  not know here
		
		System.out.println("x is: " + x);	
	}
	

}