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2013-11-17T22:09:46.217
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2013-11-17T22:17:38.577
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I guess you are doing this in the <code>ghci</code> interpreter. Then, have a look at (<code>:t</code> displays the type of an expression and a line of the form <code>a :: t</code> means <code>a</code> has type <code>t</code>): <pre><code>Prelude> let a = 3 Prelude> :t a a :: Integer </code></pre> The <code>ghci</code> interpreter commits early and gives <code>a</code> the type <code>Integer</code> though it should give any numeric type (thus <code>a :: Num t => t</code>). Now, your function receives <code>Int</code>s as arguments but since <code>a</code> and <code>b</code> are <code>Integer</code>s you get that error message. You can either remove the restrictive type signature or you can define <code>a</code> and <code>b</code> to be <code>Int</code>s. I'd go with the first option, unless there is some requirement to go with <code>Int</code>-only type signature. To do so you need to add <code>::Int</code> at the end of the definition: <pre><code>Prelude> let b = 42 :: Int Prelude> :t b b :: Int </code></pre> If you want to remove the signature recode your function to have only one line: <pre><code>max' a b = if a >= b then a else b </code></pre> Now, if you're to inspect its type: <pre><code>Prelude> :t max' max' :: Ord a => a -> a -> a </code></pre> Which means you've got a generic function which works for any type which can be ordered. An alternative is to start <code>ghci</code> using an extension: <code>ghci -XNoMonomorphismRestriction</code>. In this case: <pre><code>Prelude> let a = 3 Prelude> :t a a :: Num a => a </code></pre> which will work directly on your function. The reason why <code>ghci</code> without this extension commits to <code>Integer</code> is the <a href="http://www.haskell.org/haskellwiki/Monomorphism_restriction" rel="noreferrer">Monomorphism restriction</a>
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1. POType error while writing max function
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1. USMihai Maruseac
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1. COYou can also `:set -XNoMonomorphismRestriction` inside GHCi.
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