12 Jul
2007
12 Jul
'07
5:17 a.m.
simon:
Great - indeed,
sum [1.85, 5.95, -7.80] 8.881784197001252e-16 sum [1.85::Money, 5.95, -7.80] 0.00
I'm not yet sure these will do the best thing in all arithmetic, but it seems to be the right thing for now.
Yes, I will need to read these also. Perhaps first reading the integer and decimal digits as separate integers will help. I'm still exploring the number types.
Roman Leschinskiy tells me that there are C (or C++?) libraries for locale-specific money handling, where given precisions are mandated in particular countries, below which you must round. Perhaps we should have a binding to this. Anyway, sorting out how money is supposed to be represented in Haskell, and documenting it, seems a very useful thing. -- Don