[Haskell-cafe] Haskell beginner questions

[jim burton]

Cybertronic wrote:
> 
> Hi all, I'm pretty much new to Haskell however I'm stuck on something
> which is that I'm trying to create a function called display where I type
> in a DVD name, e.g. dvd1, it returns d (String) and the multiplication of
> q (Int) and i (Double)
> 
> Here's what I've done so far:
> 
> type Film = (Int,String,Int,Double)
> 
> dvd1 :: Film
> dvd1 = (1, "Space", 5, 9.99)
> 
> display :: Product -> String
> display (c,d,q,i) = d
> 
> My display function only shows the string but unfortunately I'm stuck on
> how to get the display function to multiply q (Int) and i (Double)
> together and display it next to d.
> 
> Can someone help me out please? :)
> 

I'd recommend a tutorial like
http://www.cs.utah.edu/~hal/docs/daume02yaht.pdf 

> display :: Film -> String
> display (c,d,q,i) = d ++ " " ++ show (fromIntegral q * i)

q needs to be converted first and show will convert the result to a string. 

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