如下:
val num = BigDecimal(1.0)
val den = BigDecimal(3.0)
println((num/den)(MathContext.DECIMAL128))
我只想到
0.3333333333333333333333333333333333
少于128人
缺省情况是MathContext。 DECIMAL128在所有计算中使用,例如,N/den的结果已经四舍五入到128处。 你们需要首先从所有价值观的角度来考虑,然后进行计算。
val mc = new MathContext(512)
val num = BigDecimal(1.0,mc)
val den = BigDecimal(3.0,mc)
println(num/den)
Don ttries and use MathContext. 联合国扫盲十年,除非你知道你的算术,否则不会产生无约束的代表性。 甚至在你试图印刷之前,它就会受到打击。
是ISO 754R Decimal128格式,34位数。 因此,产出是正确的(我假定128项参照的是128项精确度,而不是精度)。
我猜想你能够用大约四倍的精度来做自己的数学。
MathContext moreContext = new MathContext(512); // 512 bits (!) of precision
这项工作:
val mc = new java.math.MathContext(128)
val one_third = (BigDecimal(1, mc) / BigDecimal(3, mc)).toString
// 0. and a bunch of 3
one_third.filter(_ == 3 ).size // returns 128
如果你使用512个数字,就会有512个数字。
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