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

Replies are listed 'Best First'.
Re^3: Printing to stdout an array of strings and scalar references by kcott (Archbishop) on Oct 26, 2017 at 08:27 UTC
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` [download] See "perldata: Scalar value constructors" for details. — Ken	[reply] [d/l] [select]
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]
Re^5: Printing to stdout an array of strings and scalar references by kcott (Archbishop) on Oct 26, 2017 at 21:59 UTC
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	[reply] [d/l] [select]
Re^6: Printing to stdout an array of strings and scalar references by roboticus (Chancellor) on Oct 27, 2017 at 04:23 UTC
Re^7: Printing to stdout an array of strings and scalar references by kcott (Archbishop) on Oct 27, 2017 at 04:40 UTC
Some notes below your chosen depth have not been shown here
Re^3: Printing to stdout an array of strings and scalar references by eyepopslikeamosquito (Archbishop) on Oct 25, 2017 at 20:44 UTC
Yes, I'm also a fan of Perl allowing underscores in numeric literals. BTW, I was pleasantly surprised to learn that the C++ committee are also fans of this splendid idea: C++11 user-defined literals: These are extensible and use a trailing underscore. For example: `12_km` C++14 digit separators: "The single-quote character ' can now be used anywhere within a numeric literal for aesthetic readability". For example: `500'000` or `500'000_km` or `pi = 3.14159'26535'89793`. Presumably, single quote was chosen for the digit separator because underscore had already been taken by user-defined literals.	[reply] [d/l] [select]
Re^3: Printing to stdout an array of strings and scalar references by Your Mother (Archbishop) on Oct 25, 2017 at 17:23 UTC
In fact, it's a perlism I am extremely fond of. I can easily see someone in a design discussion saying, What? We don't need that informal, random parsing trouble. It's just numbers. If you can't read numbers, you shouldn't be programming. That underscore has saved me many hours of reading comprehension and probably a hundred hours of chasing bugs and mistakes in code. Update: and scratches on my monitor as I try to count digits with pen or ruler. :P	[reply]