[Haskell-beginners] print all days of calendar

[kane96 at gmx.de]

-------- Original-Nachricht --------
> Datum: Sun, 20 Dec 2009 22:25:53 +0100
> Von: Daniel Fischer <daniel.is.fischer at web.de>
> An: beginners at haskell.org
> CC: kane96 at gmx.de
> Betreff: Re: [Haskell-beginners] print all days of calendar

> Am Sonntag 20 Dezember 2009 22:11:51 schrieb kane96 at gmx.de:
> > I implemented the first step which works if I fix the months (instead of
> > the Month Enum) and just return the day and not an element of type Date
> >
> > this works:
> > calendar year = [ day | month <- [Jan, Feb], day <- [1..31],
> > legalDate(day,month,year)     == True ]
> >
> > this doesn't work:
> > calendar year = [ Date(day,month,year) | month <- Month, day <- [1..31],
> > legalDate(day,month,year)     == True ]
> 
> Date was a type synonym for the triple, so
> calendar year 
>     = [ (day,month,year) | month <- Month, day <- [1..31],
> legalDate(day,month,year)]
> 
> should be what you want.
> Note, "condition == True" is better written as "condition".

still have the problem that it says:
"Not in scope: data constructor `Month'" but Month is declared as:
data Month = Jan | Feb | Mar | Apr | May | Jun | Jul | Ago | Sep | Oct | Nov | Dec deriving (Eq,Enum,Show)

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