Haskell编码..请帮助 [英] Haskell coding..please Help

问题描述

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

getArea a b = a * b

这是我的代码.

当我在WinHugs中加载它时..

this is my code..

when i load it in WinHugs..

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

我该怎么办?..

what should i do?..

推荐答案

" len<-getLine putStr

"Length: " len <- getLine putStr

" wid<-getLine putStr

"Width: " wid <- getLine putStr

getArea len wid getArea a b = a * b

getArea len wid getArea a b = a * b

这是我的代码.

当我在WinHugs中加载它时..

this is my code..

when i load it in WinHugs..

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

我该怎么办?..

what should i do?..

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