Ruby:以科学记数法控制打印 [英] Ruby: Controlling printing in scientific notation

问题描述

如果我在 Ruby 中有一个非常长的浮点数，例如:

If I have an extremely long floating point number in Ruby such as:

 x = 123456789012345.to_f

当它显示时，比如通过 to_s，它以科学计数法出现:

when it is displayed, say, via to_s, it appears in scientific notation:

 "1.23456789012345e+14"

有没有办法抑制科学记数法的格式，或者在硬币的另一面，强制使用极短的浮点数?

Is there any way to suppress the formatting in scientific notation, or on the other side of the coin, force it for extremely short floating point numbers?

推荐答案

您可以使用 % 运算符.例如:

You can do all sorts of things using the % operator. For example:

x = 123456789012345.to_f
"%f" % x  # => "123456789012345.000000"

y = 1.23
"%E" % y # => "1.230000E+000"

各种选项与 sprintf 函数相同.

The various options are the same as for the sprintf function.

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