Re: Decimal Literals
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 ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
Monad constructors
Why must every Monad instance be a datatype or newtype, even if there will be just a single constructor? Peter ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
constructors in O'Haskell
How may I hide constructors in O'Haskell 'cause export lists don't work in this language? Peter ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
Re:Decimal Literals
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 [EMAIL PROTECTED] ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
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