将小数点后四舍五入到小数点后两位 [英] Rounding decimal number upto two decimal places

问题描述

我正在尝试将十进制数四舍五入到小数点后两位，这非常有效.我正在做如下:

I am trying to round decimal number upto two decimal places which is working perfectly. I am doing as below :

Math.Round(Amount, 2)

因此，如果我的金额为 40000.4567 ，我会得到 40000.46 ，这正是我想要的.现在的问题是我有一个十进制数字，如 40000.0000 ，当我四舍五入时，结果是 40000 ，而我真正想要的是 40000.00 .因此，回合将始终忽略尾随零.

So, if I have Amount as 40000.4567, I am getting 40000.46which is exactly what I want. Now problem is I have decimal number like 40000.0000, when I round it, the result is 40000, and what I really want is 40000.00. So round will always neglect trailing zeros.

要解决此问题，我可以选择将其转换为字符串并使用format，但是我不想这样做，因为这样做效率不高，我相信必须有一些方法可以更好地做到这一点.

To solve this problem, I have the option of converting it to string and use format , but I don't want to do that as that will be inefficient and I believe there must be some way to do it better.

我也尝试过

Decimal.Round(Amount, 2)

现在一种方法是检查数字是否包含小数部分并相应地使用round函数，但这确实是一种糟糕的方法.由于明显与数量有关的原因，我也不能使用truncate.

Now one way can be to check whether number contains anything in fractional part and use round function accordingly , but that is really bad way to do it. I can't use truncate as well due to obvious reasons of this being related to amount.

怎么回事?

推荐答案

是正确舍入，但是您无法理解 value 不是格式.两个值 40000 和 40000.00 之间没有差异，并且类似的问题也会出现 3.1 .

It is rounding correctly but you fail to understand that the value is not the format. There is no difference between the two values, 40000 and 40000.00, and you'll have a similar issue with something like 3.1.

只需使用格式将任意数字输出到小数点后两位，例如:

Simply use formatting to output whatever number you have to two decimal places, such as with:

Console.WriteLine(String.Format("{0:0.00}", value));

或:

Console.WriteLine(value.ToString("0.00"));

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