On Sun, Oct 17, 2004 at 07:16:51AM -0700, Peter Stranney wrote:
equalString :: String -> String -> Bool equalString [] [] = True equalString [] (c':s') = False equalString(c:s) [] = False equalString(c:s)(c':s') = equalChar c c'^ equalString s s' ^^^^^^
this function is to see if one string is equal to another.
but when i compile this i get the error; - Instance of Integral Bool required for definition of equalString
You are using the raise-to-the-power-of operator, which requires it's second parameter to be Integral... (^) :: (Integral b, Num a) => a -> b -> a You might also want to look at the earlier `any prefix of tails' suggestion, as it makes the solution a rather simple one-liner. Good luck, Remi -- Nobody can be exactly like me. Even I have trouble doing it.