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Re:Decimal Literals

2003-07-11 Thread jmaessen 
Ketil Z. Malde <[EMAIL PROTECTED]> writes:
> I.e. for 3.14, allow any rational number in [3.14,3.15), or
> perhaps (3.135,3.145]?  Or restrict it to just the rational number in
> range with the least total digits?

We can get this effect using a version of (%) adapted specifically for
converting decimal floating-point constants.  Thus:

Data.Ratio> 31415926536%10
3926990817 % 12500

Data.Ratio> let n %% d = approxRational (n%d) (1%(2*d)) in
31415926536 %% 100
312689 % 99532

We can imagine the compiler replacing floating constants by
fromRational (n%%d) rather than fromRational (n%d).

Of course, then trailing zeros suddenly become significant:

Data.Ratio> let n %% d = approxRational (n%d) (1%(2*d)) in  314 %% 100
22 % 7
Data.Ratio> let n %% d = approxRational (n%d) (1%(2*d)) in  3140 %% 1000
135 % 43

This might be good or bad, depending on your perspective.

-Jan-Willem Maessen
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constructors in O'Haskell

2003-07-11 Thread Peter Padawitz 
How may I hide constructors in O'Haskell 'cause export lists don't work 
in this language?

Peter

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Re: Decimal Literals

2003-07-11 Thread Ketil Z. Malde 
Ashley Yakeley <[EMAIL PROTECTED]> writes:

> There should be a separate syntax for that. As it stands, the string 
> "3.1415926536" unambiguously specifies a rational number. Perhaps 
> something like "3.1415926536..." should be interpreted as the 'simplest' 
> rational that agrees with the given digits, which would then be passed 
> to fromRational.

I.e. for 3.14, allow any rational number in [3.14,3.15), or
perhaps (3.135,3.145]?  Or restrict it to just the rational number in
range with the least total digits?

-kzm
-- 
If I haven't seen further, it is by standing in the footprints of giants
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Monad constructors

2003-07-11 Thread Peter Padawitz 
Why must every Monad instance be a datatype or newtype, even if there 
will be just a single constructor?

Peter

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