[fpc-pascal] floating point an FPC

[Jonas Maebe]

On 26 Feb 2010, at 11:37, ik wrote:

> I've made a small test:
>
> if (0.1+0.2) = 0.3 then
>
> The only compiler/interpator that actually tells that it equal is FPC.

Then you are very lucky that FPC says it is equal.

> I've tested it using Javascript (in Firefox), Ruby, Python, C (gcc)  
> and
> Perl.

They are just as correct as FPC.

> Except FPC, everyone tells that 0.1+0.2 = 0.30000000000000004

And that answer is also correct.

> Can someone explain how FPC see the result and why others does not  
> see it
> like that ?

It's because of the way floating point works. Read e.g. http://www.lahey.com/float.htm


Jonas