Hello all, Playing around with Haskell... I'm writing a 'choose' function: --//-- fac :: Int -> Int fac 0 = 1 fac n = n*fac(n-1) choose :: Int -> Int -> Int choose n k = fac(n) / (fac(k) * fac(n-k)) --//-- I'm having problems with the last line. --//-- Prelude> :l test.hs Compiling Main ( test.hs, interpreted ) test.hs:13:20: No instance for (Fractional Int) arising from use of `/' at test.hs:13:20 Probable fix: add an instance declaration for (Fractional Int) In the definition of `choose': choose n k = (fac (n)) / ((fac (k)) * (fac (n - k))) Failed, modules loaded: none. --//-- The problem is that it doesn't like the / sign. For example, if I replace the / by * the function is compiled just fine. Does anyone know what I'm missing? Cheers, Daniel. -- /\/`) http://oooauthors.org /\/_/ http://opendocumentfellowship.org /\/_/ \/_/ I am not over-weight, I am under-tall. /