Clojure舍入为小数位 [英] Clojure rounding to decimal places

问题描述

我有字符串表示十进制值，
ex：0.010，0.010000000.01000

I have strings which represents the decimal values, ex: "0.010", "0.0100000" "00.01000"

格式，
ex：＃。##

I want to round them to specified format, ex: #.##

在Java中，我们有：

In Java we have:

public BigDecimal setScale(int newScale, RoundingMode roundingMode) {
    return setScale(newScale, roundingMode.oldMode);
}

在Clojure中实现这个最好的方法是什么？ / p>

What is the best approach to achieve this in Clojure rather than using interop?

推荐答案

您可以使用Clojure的格式它应该为您的问题提供解决方案。以下是一些示例和参考：

You can use Clojure's format for this purpose. It should provide you a solution to your problem. Here are some examples and a reference:

user=> (format "%.2f" 0.010)
"0.01"
user=> (format "%.2f" 0.010000)
"0.01"
user=> (format "%.2f" 00.010000000)


user=> (doc format)
-------------------------
clojure.core/format
([fmt & args])
  Formats a string using java.lang.String.format, see java.util.Formatter for format
  string syntax

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