Question

c＃中有一种简单的方法可以将小数舍入到最近的四分之一，即x.0，x.25，x.50 x.75 例如，0.21将舍入到0.25,5.03将舍入到5.0

提前感谢您的帮助。

Answer 1

将它乘以四，round，因为你需要一个整数，然后再将它除以四：

x = Math.Round (x * 4, MidpointRounding.ToEven) / 4;

四舍五入的各种选项及其解释可以在这个出色的答案here中找到： - ）

Answer 2

或者，您可以使用此博客中给出的UltimateRoundingFunction： http://rajputyh.blogspot.in/2014/09/the-ultimate-rounding-function.html

//amountToRound => input amount
//nearestOf => .25 if round to quater, 0.01 for rounding to 1 cent, 1 for rounding to $1
//fairness => btween 0 to 0.9999999___.
//            0 means floor and 0.99999... means ceiling. But for ceiling, I would recommend, Math.Ceiling
//            0.5 = Standard Rounding function. It will round up the border case. i.e. 1.5 to 2 and not 1.
//            0.4999999... non-standard rounding function. Where border case is rounded down. i.e. 1.5 to 1 and not 2.
//            0.75 means first 75% values will be rounded down, rest 25% value will be rounded up.
decimal UltimateRoundingFunction(decimal amountToRound, decimal nearstOf, decimal fairness)
{
    return Math.Floor(amountToRound / nearstOf + fairness) * nearstOf;
}

请在下面拨打标准舍入。即1.125将四舍五入至1.25

UltimateRoundingFunction(amountToRound, 0.25m, 0.5m);

请在下面调用以舍入边框值。即1.125将四舍五入为1.00

UltimateRoundingFunction(amountToRound, 0.25m, 0.4999999999999999m);

所谓的“银行家的舍入”是不可能使用UltimateRoundingFunction，你必须使用paxdiablo的答案来支持：）

在C＃中将小数舍入到最接近的四分之一

2 个答案: