CODEWITHSUNDEEP
haskell
user3886346
user3886346

Reputation: 1

Haskell - Let in expression

Im trying to replicate the example of the book "Learn a Haskell for a Great Good", with the use of let and in.

The thing is that, although I write the same code in the same way, it doesn't work and shows me a failure with the second "=" in the second variable.

Can anyone help me with this issue?

cylinder :: (RealFloat a) => a ->a ->a
cylinder r h = 
      let sideArea = 2*pi*r*h
          topArea = pi*r^2
      in sideArea + 2*topArea

Upvotes: 0

Views: 142

Answers (1)

Zacharie 007
Zacharie 007

Reputation: 126

This worked for me:

   Prelude CA> let cylinder r h = 
   Prelude CA|       let sideArea = 2*pi*r*h
   Prelude CA|           topArea = pi*r^2
   Prelude CA|       in sideArea + 2*topArea
   Prelude CA| 
   Prelude CA> cylinder 5 9
   439.822971502571

I guess it's simply an indentation problem

   <interactive>:48:5: parse error (possibly incorrect indentation)

Upvotes: 1

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