Floating point error in representation?

when i make this multiplication

0.94 * 8700

the output is

8177.999999999999

but it should have been

8178

i'm using java , but i don't think this error is related to a particular Programming language now my question is ... why this happened ??

and what other numbers (just as an example) cause the same error?

The specific reason in your case is that the real number 0.94 cannot be represented exactly in a double precision floating point. When you type 0.94, the actual number stored is 0.939999999999999946709294817992486059665679931640625.

It isn't an error. IEEE floats can't represent decimal numbers exactly.