Re: Numeric Literals (Summary 2)

On Monday, November 18, 2002, at 10:57  AM, Michael Lazzaro wrote:
<summary list>

.... Eek, that one was short-lived!  No problem: if Larry decides on Ada 
syntax, the following changes happen:

    s/:/#/  (for explicit radix)
    s/./:/  (for dotted -- er, coloned -- form)

- floating point becomes allowed in explicit radix (and 0b,0c,0x)

Everything else stays the same.


> Other issues w/ literals:
>
> - radix <= 32, alpha digits may be upper or lowercase
> - underlines may appear ONLY between digits
> - dotted form may therefore not have underlines
> - radix < 2 throws error
> - negative sign goes before radix, e.g. -20:1GJ, in
>    order to match usage in cases like -0x00ff.
> - need to specify RADIX_MAX
>
> - can't have runtime radix, e.g. 2**8:10, because : binds
>    tighter.  can't say (2**8):10, because not a literal
>    anymore, and ':' is used for adverbial in many locations
>    (ambiguous).
>
> - need to verify that 0b1, 0c1, 0x1 are still allowed in addition to 
> explicit radix (but seems appropriate to leave them in, given their 
> frequency.)

MikeL