[Haskell-cafe] Trouble with indentation

[Dougal Stanton]

On 09/01/2008, Fernando Rodriguez <frr149 at easyjob.net> wrote:
>
> However, ghc complains about: parse error on input `=' at the "if m <= 2
> then " line. I believe this is some sort of layout error.  Can someone point
> out what I am doing wrong?

Assuming the layout didn't get munged during the email process, the
problem is that the 'if' can't go there. You need to have 'sth = if
...' not 'if cond then sth = '

> diaDeSemana d m a = toEnum num :: DiaSemana
>                                         where
>                                                 num = zeller x y z
>                                                 zeller x y z = (700 + (26 * x - 2) `div` 10
>                                                         + d + y + y `div` 4 + z `div` 4 - 2 * z)
>                                                         `mod` 7
>                                                 if m <= 2 then
>                                                         x = m + 10
>                                                         y = (a - 1) `mod` 100
>                                                         z = (a-1) 'div' 100
>                                                 else
>                                                         x = m - 2
>                                                         y = a  `mod` 100
>                                                         z = a `div` 100

Maybe try:

> (x,y,z) = if m <= 2
>              then (m+10, (a-1)`mod`100, (a-1)`div`100)
>              else (m-2 ,     a`mod`100,     a`div`100)

I haven't tested this though....

-- 
Dougal Stanton
dougal at dougalstanton.net // http://www.dougalstanton.net