获得不同的结果Math.Round [英] Getting different result in Math.Round

问题描述

ticketPriceInPence = 7360
percentageToRefund = 100

(int)(Math.Round((ticketPriceInPence * 0.01) * (percentageToRefund * 0.01), 2, MidpointRounding.AwayFromZero) * 100)

这导致：73.59

(int)(Math.Round((ticketPriceInPence * 0.01) * (percentageToRefund * 0.01) * 100, 2, MidpointRounding.AwayFromZero))

这导致：73.60

任何想法，为什么它会导致不同的2种不同的结果。

Any idea why it results in different 2 different results

推荐答案

这是的重新$ P的>旧的情况下 $ psent小数正是。

It's the old case of floating point numbers not being able to represent decimals exactly.

您似乎与金钱打交道这里，然后你真的应该考虑使用的小数。

You seem to be dealing with money here and then you really should consider using decimal.

decimal ticketPriceInPence = 7360;
decimal percentageToRefund = 100;
var result1 = (int)(Math.Round((ticketPriceInPence * 0.01m) * (percentageToRefund * 0.01m), 2, MidpointRounding.AwayFromZero) * 100);
var result2 = (int)(Math.Round((ticketPriceInPence * 0.01m) * (percentageToRefund * 0.01m) * 100, 2, MidpointRounding.AwayFromZero));

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