private void inputState4( String s )
	{
		if ( isDigit(s)||s.equals("+/-")||s.equals(".") )
		{
			textField.setText("0");
			state = 5;
			inputState5(s);
		}
		
		if ( isOperator(s))
			operator = s;
		if ( s.equals("1/x") )
		{
			state = 3;
			operator = "";
			inputState3(s);
		}
		if ( s.equals("C") || s.equals("Backspace") )
		{
			state = 0;
			textField.setText("0");
		}
	}