Add reference to _ as digit separator.

[Ismael-VC]

Ref: http://stackoverflow.com/questions/31546263/digit-separator-in-julia

[av skip]

[Ismael-VC]

Perhaps add more examples?

[ScottPJones]

Wouldn't the normal breaking place here be 10_000.100_01 (i.e. at the 1000's places)

[Ismael-VC]

True!

I could also squeeze more examples with hexadecimal. etc in the same line with tuples:

julia> 10_000, 0_000.100_01, 0xdead_beef, 0b101_001
(10000,0.10001,0xdeadbeef,0x29)

[ScottPJones]

Would it be more likely with 0b to have _ every 4, instead of 3? (i.e. same as hex digit).
I think for floating point, maybe a better example would be something like:
0.000_000_050 (i.e. 50 nano whatever)

[ScottPJones]

I like the other examples, this documentation is nice to have, I never even knew julia had a digits separator.

[Ismael-VC]

Do you think this is the right place in the document to put this? I put this after the explanation of integers and floating points literals because it applies to all numeric types.

[ScottPJones]

Maybe in front, because looking at it again, it is really in the middle of the floating point section.

[matthieugomez]

Maybe it should not appear in the floating point section since it works for integers too. What about a small paragrah about all the ways to write 10^4 ? (1e4 is a floating point but 10_000 and 10^4 are integers). After all both e and _ are special symbols.

[Ismael-VC]

@matthieugomez that's also what I thought I'll change the paragraph near the end, and reference both symbols special cases, thanks!

[NevilleDNZ]

Note: Algol68 sidestepped the entire issue by allowing a space in a number, for example: 1 million could be 1 000 000, and π could be 3.14159 26535 89793 23846 ... Decimal Exponent Symbol is part of "The Unicode Standard" e.g. 6.0221415⏨23 - it is included as U+23E8 ⏨ decimal exponent symbol to accommodate usage in the programming languages Algol 60 and Algol 68. cf. http://www.fileformat.info/info/unicode/char/23e8/index.htm