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四舍六入五成双 #10

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Hzzz opened this issue Jan 18, 2016 · 0 comments
Open

四舍六入五成双 #10

Hzzz opened this issue Jan 18, 2016 · 0 comments

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@Hzzz
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Hzzz commented Jan 18, 2016

浮点数计算时的一种修约规则。

wiki

对于位数很多的近似数，当有效位数确定后，其后面多余的数字应该舍去，只保留有效数字最末一位，这种修约（舍入）规则是“四舍六入五成双”，也即“4舍6入5凑偶”这里“四”是指≤4 时舍去，"六"是指≥6时进上，"五"指的是根据5后面的数字来定，当5后有数时，舍5入1；当5后无有效数字时，需要分两种情况来讲：①5前为奇数，舍5入1；②5前为偶数，舍5不进。（0是偶数）

test

v s f sqc5i4n2lufnanpf

reslove

先乘再除

key word big decimal
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