lo all, ive got a question about floats thats bothering me :s i was wondering what sort of range i can store in a float and with what accuracy... say i have an engine where 1.0 is a kilometre, and 0.001 is a meter and i need accuracy to one meter. what would be the maximum size of the world? i know its a trade-off between size and accuracy but dont know much else :> any help would be greatly appreciated Fusi0n "We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle

Common now, a trivial Google search or even a browse through MSDN would yield your answer...

The maximum value for float is 3.402823466 x 10³⁸, with 6 decimal digits of precison. Go here for additional specs.

You could allways use long's... 2147km with a resolution of 1mm :D

[edited by - Tjoppen on October 26, 2002 11:30:39 AM]

cheers didnt think of googlin it :D
ill have a look at longs as well

ta, Fusi0n

"We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle

"IEEE 754" is the magic search term.

"What Every Computer Scientist Should Know About Floating-Point Arithmetic" :
http://docs.sun.com/source/806-3568/ncg_goldberg.html

--
Simon O''Connor
Creative Asylum Ltd
www.creative-asylum.com

If I''m not mistaken about the OP''s question, the maximum size of a float isn''t what he''s interested in. If you ever use a point in the world around, say, 2e30 you wouldn''t have any precision at all. I don''t feel like counting now, but the smallest point would probably be around a few km.

You could use __int64 as well...