multiplication and division algorithms commonly used in BigDecimal

Not much to say, let’s record it first. BigDecimal coins = new BigDecimal(“0”); BigDecimal one = new BigDecimal(“1”); BigDecimal two = new BigDecimal(“2”); coins = coins.add( two ); //coins plus 2 System.out.println( coins.doubleValue()); //output is 2.0 coins = coins.subtract( one ); //coins minus 1 System.out.println( coins.doubleValue()); //The output is 1.0 coins = coins.multiply( two ); //coins are multiplied by 2 System.out.println( coins.doubleValue()); //The output is 2.0 int i = coins .compareTo(BigDecimal.ZERO) ; //Judge whether coins is greater than 0 int k = coins .compareTo( one ) ;//If i = 0, it means they are equal; if i 0 means coins > one coins = coins.setScale(2,BigDecimal.ROUND_HALF_UP) //Save two decimal places Division is trickier: When the bigdecimal type does division, there is no problem when the result is an integer or a finite decimal. If the result cannot be divisible, an error will be reported for an infinite decimal Error code: Bigdecimal bd = num1.divide(c).setScale(6,ROUND_HALF_UP); Error message: Non-terminating decimal expansion; no exact representable decimal result” Error translation: infinite decimal expansion; no exact decimal result. Reason for error: temporarily unknown Code improvements: BigDecimal bd = num.divide(c,6,ROUND_HALF_UP);