PureBasic Forums - English

A floating point number is stored in a way that makes the binary point "float" around the number, so that it is possible to store very large numbers or very small numbers. However, you cannot store very large numbers with very high accuracy (big and small numbers at the same time, so to speak).

Another limitation of floating point numbers is that they still work in binary, so they can only store numbers exactly which can be made up of multiples and divisions of 2. This is especially important to realise when you try to print a floating point number in a human readable form (or when performing operations on that float) - storing numbers like 0.5 or 0.125 is easy because they are divisions of 2. Storing numbers such as 0.11 are more difficult and may be stored as a number such as 0.10999999. You can try to display to only a limited range of digits, but do not be surprised if the number displays different from what you would expect!

This applies to floating point numbers in general, not just those in PureBasic.

Like the name says the doubles have double-precision (64 bit) compared to the single-precision of the floats (32 bit). So if you need more accurate results with floating point numbers use doubles instead of floats.

ankachen wrote:Hi guys, I got a little problem with math.

I wonna have the result of "a.f=1/10".

I got "0.10000000149012".

If I wonna get jst "0.1", how could I gonna do?

any suggestions will be appreciated.

a.f = 1 / 10
Debug StrF(a, 1)