[Haskell-cafe] Re: Begginer question

6 Jan 2005


      Ketil Malde wrote:
...
Maurício  writes:
...
(...)
...
Couldn't match `Float' against `Complex Float'
        Expected type: Float
        Inferred type: Complex Float
    In the second argument of `(+)', namely `sqr_delta'
    In the definition of `x1': x1 = (b + sqr_delta)
The error message says it all, really.
...
(...)
Note that Haskell doesn't automatically convert arguments for you --
this is a feature.
-kzm
When I type this:

*****
import Complex;
a = 3 :+ 4;
*****

and load it into ghci, "a + 4" gives me "7.0 :+ 4.0", although "a + 
(4::Float)" gives me that error again. Why Haskell converts "4" to 
Complex but not a Float?

   Maurício