High-precision Operation

In the development of high-precision operation is not very frequent, the precision of float and double can actually meet the overwhelming majority of needs, and high-precision operation is slower than the normal operation, but the use of high-precision operation is often used in the convenient API. The class of high precision operations provided by the Crown is mainly two

BigInteger: When the range of values exceeds long, use BigDecimal: almost cover the BigInteger function, you can also retain any number of decimal places, theoretically infinite, the following main explanation of this class
　　
Note: Both APIs are similar

Subtraction

BigDecimal AAA = new BigDecimal (20);

BigDecimal bbb = new BigDecimal (3);

BigDecimal AAA. Add (BBB): an addition operation that returns the result of an operation

BigDecimal AAA. Subtract (BBB): subtraction, returns the result of an operation

BigDecimal AAA. Multiply (BBB): multiplication, returning result after operation

BigDecimal AAA. Divide (BBB): division operation, returning result after operation

Keep decimal points

Mainly for the division operation, there may be an infinite number of decimals, if not rounding operation will be an error

BigDecimal result = Aaa.divide (BBB, 8, BIGDECIMAL.ROUND_HALF_UP);

Parameter 1: Divisor

Parameter 2: Reserved precision, requires retention of several decimals

Parameter 3: Rounding mode, often several rounding methods

BIGDECIMAL.ROUND_HALF_UP: Rounding

Bigdecimal.round_ceiling: Rounding the upper limit value, such as the result of 1.1, returns 2

Bigdecimal.round_floor: Rounding lower values, such as 1.8, returns 1

Other APIs

* *value (): Convert to basic data type such as Aaa.intvalue (), Aaa.doublevalue (), etc.

BigInteger Tobiginteger (): Convert to BigInteger type

Bigdecimal.zero: Rep 0

Bigdecimal.one: Rep 1

Bigdecimal.ten: Rep 10

High-precision Operation