1.Math.Round：四舍六入五取偶
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Math.Round(0.0) //0 Math.Round(0.1) //0 Math.Round(0.2) //0 Math.Round(0.3) //0 Math.Round(0.4) //0 Math.Round(0.5) //0 Math.Round(0.6) //1 Math.Round(0.7) //1 Math.Round(0.8) //1 Math.Round(0.9) //1 |
说明：对于1.5，因要返回偶数，所以结果为2。
2.Math.Ceiling：只要有小数都加1
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Math.Ceiling(0.0) //0 Math.Ceiling(0.1) //1 Math.Ceiling(0.2) //1 Math.Ceiling(0.3) //1 Math.Ceiling(0.4) //1 Math.Ceiling(0.5) //1 Math.Ceiling(0.6) //1 Math.Ceiling(0.7) //1 Math.Ceiling(0.8) //1 Math.Ceiling(0.9) //1 |
说明：例如在分页算法中计算分页数很有用。
3.Math.Floor：总是舍去小数
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Math.Floor(0.0) //0 Math.Floor(0.1) //0 Math.Floor(0.2) //0 Math.Floor(0.3) //0 Math.Floor(0.4) //0 Math.Floor(0.5) //0 Math.Floor(0.6) //0 Math.Floor(0.7) //0 Math.Floor(0.8) //0 Math.Floor(0.9) //0 |
from:https://www.cnblogs.com/rwh871212/p/6962099.html