/**

	 * parse double f to num decimals

	 * @param f

	 * @param num the decimal number

	 * @return the format number

	 */

	 public double decimalNum(double f, int num) {

		 BigDecimal bg = new BigDecimal(f);

	        double f1 = bg.setScale(num, BigDecimal.ROUND_HALF_UP).doubleValue();

	     return f1;

    }