private void inputState0( String s )
	{
		if ( isDigit(s)||s.equals("+/-")||s.equals(".") )
		{
			state = 2;
			textField.setText("0");
			inputState2(s);
		}
		if ( isOperator(s) )
		{
			op1 = "0";
			operator = s;
			state = 4;
		}
		if ( s.equals("1/x") )
		{
			textField.setText(errMsg);
			state = 1;
		}
	}