CODEWITHSUNDEEP
haskellsyntax-error
user2891198
user2891198

Reputation: 89

New to Haskell and there is unexpected '='

I am totally new to Haskell and try to follow the script in lecture notes. I created a file called lecture.hs

root (a, b, c) = ((-b -r)/e, (-b + r)/e))
 where d = b*b - 4*a*c
       r = sqrt d
       e = 2*a

when I load this file to hugs it shows

ERROR "lecture.hs":3 - Syntax error in input (unexpected `=')

and when I load it to ghci it shows

[1 of 1] Compiling Main             ( lecture.hs, interpreted )

lecture.hs:3:14: parse error on input `='
Failed, modules loaded: none.

Please help me out. Thanks!

Upvotes: 2

Views: 308

Answers (1)

duplode
duplode

Reputation: 34398

As pasted here, your snippet is syntactically valid. In any case, the following is sure to work:

root (a, b, c) = ((-b -r)/e, (-b + r)/e)
    where
    d = b*b - 4*a*c
    r = sqrt d
    e = 2*a

Naturally, indentation style is to a significant extent a personal choice. I like placing where in a separate line because that way I can indent the code predictably in four space steps. Whatever style you choose, don't use tabs to indent, as that leads to a lot of confusion.

Upvotes: 4

Related Questions