in reply to Re^2: Printing to stdout an array of strings and scalar references
in thread Printing to stdout an array of strings and scalar references

You can use underscores with decimal, hexadecimal, octal and binary numbers. You can also place them wherever you want, for convenient viewing of the data in question. They don't have to be a direct replacement of commas: both 50_00_00 and 500_000 are valid representations of 500,000; although, the first one is probably a poor choice because it's likely to be confusing.

Here's some highly contrived examples (purely to demonstrate those points): 

$ perl -E 'say 1_6'
16
$ perl -E 'say 0x1_0'
16
$ perl -E 'say 02_0'
16
$ perl -E 'say 0b1_00_00'
16

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See "perldata: Scalar value constructors" for details.

— Ken

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Re^4: Printing to stdout an array of strings and scalar references
by afoken (Chancellor) on Oct 26, 2017 at 20:55 UTC
    both 50_00_00 and 500_000 are valid representations of 500,000; although, the first one is probably a poor choice because it's likely to be confusing.

    Not everyone on earth seperates digits in groups of three. In India, it is common to use groups of two and groups of three, mixed: Indian numbering system.

    Alexander

    --
    Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)
[reply]

      Curiously, I was actually thinking of that when composing my post. I thought their non-standard grouping was four; so five hundred thousand, 500_000, would be fifty myriad, 50_0000 (although they have a different word for myriad).

      Anyway, the point was that you can put the underscores wherever you want (so long as you don't put two or more together). And the examples were already getting almost to the point of silliness (e.g. 16 as 1_6), without embarking on a world-tour of numbering systems.

      Thanks for the link: I did have a quick look; I was wrong about the myriad grouping; it's been about 15 years since I last encountered that, so I'm not overly surprised that it wasn't fresh in my memory.

      — Ken

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        kcott:

        Yeah, there are lakhs of ways to skin a cat...

        ...roboticus

        When your only tool is a hammer, all problems look like your thumb.

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