Haskell coding..please Help

Question

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--Compute for Rectangular Area
main = do
        putStr $ "Length: "
        len <- getLine
        putStr $ "Width: "
        wid <- getLine
        putStr $ getArea len wid

getArea a b = a * b

this is my code..

when i load it in WinHugs..

MSIL

ERROR file:{Hugs}\packages\bin\RecArea.hs:2 - Unresolved top-level overloading
*** Binding             : main
*** Outstanding context : Num [Char]

what should i do?..

Posted 21-Mar-11 3:35am

jovhenni19

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2 solutions

Solution 1

You should learn to use google. When you search for "haskell", you get back over 8 million hits. Surely, there's a web site or forum somewhere that indicates an answer.

Posted 21-Mar-11 3:38am

#realJSOP

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jovhenni19 21-Mar-11 10:12am

can't find an answer...
maybe someone here would help me..
Thanks for replying!

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Kubajzz · Accepted Answer · 2011-03-21T04:13:00

Solution 2

I guess the problem is that getLine gives you a string, but you need a number to do the multiplication. Check out the read function.

And, by the way, asking Google is really faster...

Posted 21-Mar-11 4:13am

Kubajzz