----------------------------------- neokewl Tue Jan 02, 2007 7:54 pm Conversion of integer to float ?? in Haskell ----------------------------------- Hey I was trying out a program to find the area of cirlce in Haskell. I have a problem in converting the data types from integer to float. The pgm is as follows: type Point = (Int,Int) data Fig = Pt Point | Circle Point Int area :: Fig -> Float area (Circle a b) = 3.141 * b*b the above definition of area of circle is giving me compile errors as 3.141 is a fractional value. How do i convert the integer value of b to floating point so tht the multiplication is compatible. thnx neokewl ----------------------------------- Clayton Tue Jan 02, 2007 7:56 pm ----------------------------------- Is it necessary that 'b' be the type of Integer? Also, next time please use [code][/code] tags :D ----------------------------------- neokewl Tue Jan 02, 2007 8:00 pm ----------------------------------- yes b is of type integer as the constructor Circle takes a Point and Int as arguments... yea next time i will put code tags ... sorry 4 tht... ----------------------------------- Clayton Tue Jan 02, 2007 9:47 pm ----------------------------------- That's the point I'm trying to make though, why not just have your Point have two Floats, and then have the Circle constructor take the point, and a Float? ----------------------------------- neokewl Tue Jan 02, 2007 10:59 pm ----------------------------------- yes.. it works fine if we define point as type Point = (Float,Float) ... thts the easy way out .... i want to figure out how to do type conversion in haskell .... sometimes the data one gets may not be as we require it .... ----------------------------------- Clayton Tue Jan 02, 2007 11:06 pm ----------------------------------- well in this sort of application, Floats actually make more sense, because the following is a perfectly legal ordered pair (or point) (1.2, 5.3) and the radius of your circle isn't always going to be an integer. ----------------------------------- neokewl Tue Jan 02, 2007 11:10 pm ----------------------------------- yes ..i agree with u tht floats make more sense .... but given a situation where u are given int... isnt there a way for type conversion in haskell.... my aim is not to find the area of the circle or rectangle , but it is to understand type conversion in haskell .... its just some problem i formulated myself ..... to do this... ----------------------------------- wtd Wed Jan 03, 2007 1:04 am ----------------------------------- Perhaps the fromInteger function? ----------------------------------- neokewl Thu Jan 04, 2007 4:16 pm ----------------------------------- Hi, The fromInteger function works fine for Integer type to float type. Thnx buddy. Cheers neokewl