除非数字是数学整数，否则以两位小数打印浮点数 [英] Print float with two decimals unless number is a mathematical integer

问题描述

是否有一种简单的方法将浮点值打印为带小数的字符串，如果该值具有小数，否则明智地将其打印为没有小数的int?

Is there a simple way of printing a floating value as a string with decimals if the value has decimals, other wise print it like an int without decimals?

12.5 would print 12.50
15.0 would print 15

有没有简单的方法可以做到这一点?我可以想到的方法包括将float解析为字符串到int，但这似乎不是最佳方法.

Is there a simple way to do this? I can think of ways which includes parse floats to strings to ints but it doesn't seem optimal.

此答案不不会执行我想要的操作:

This answer does not do what I want: Show decimal of a double only when needed

如果值只有一个小数，则此答案仅显示一个小数.我需要的是两位小数，或者什么都没有.

This answers only shows one decimal if the value only has one decimal. What I need is two decimals, or nothing.

推荐答案

您可以使用 String.format() ，如果用

You can use String.format(), and strip off the decimal if it's .00 with removeSuffix():

fun Double.toMyFormat(): String =
    String.format("%.2f", this).removeSuffix(".00")

fun main() {
    println(12.5.toMyFormat())
    println(15.0.toMyFormat())
}

打印:

12.50
15

这也适用于四舍五入的数字，例如12.999等.

This also works with rounded numbers such as 12.999 etc.

这篇关于除非数字是数学整数，否则以两位小数打印浮点数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！