On Monday 23 November 2009 07:31:05 am Dominic Sim wrote:
I am trying to retrieve the decimal portion of a Double. My code is:
getDecimal x = x - floor(x)
The problem is that x is a double (or some other kind of floating point or fraction), and "floor x" is an integer, and you can't subtract an integer from a double. To convert "floor x" to a double (or to any other relevant type), use "fromIntegral", like: getDecimal x = x - fromIntegral(floor x) However, what I'd really suggest is that you use: getDecimal x = snd (properFraction x) or, in pointfree style: getDecimal = snd . properFraction Also, the type signature for getDecimal should be: getDecimal :: RealFrac a => a -> a That will allow it to be used with any Real or Fractional type. Shawn.