It is not always possible to precisely represent decimal values as a float type in binary. In these cases, the value that you have is either slightly bigger or slightly smaller than the actual. In your specific problem, you have two values that are not equal, but very similar. Therefore you get a small negative value when subtracting them. You just have to keep this fact in mind whenever you want to do high- precision computing. On Tue, 2006-03-28 at 15:30 -0600, Jay Blanchard wrote: > [snip] > I've got a strange problem here. > > I'm subtacting one variable from another, both of type "double" and if > they are the same, instead of getting a result of 0, I get something > like -9.99200722163E-016 > > Is this a bug or am I doing something wrong here? > [/snip] > > From all of the information that you sent in your post I'd say that > you're doing something wrong here. > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
