Napr. tuto mas viac pokecu, ak by ta to nahodou zaujimalo. Vidiet tam jasne ze aj extended ma chyby, samozrejme.
http://rvelthuis.de/articles/articles-floats.html
Napr. zaujimave je aj toto
To by vysvetlovalo ze preco nahodou toto cislo v extended nahodou zaokruhluje tak, ale bude to zavisiet od zadaneho cisla (skusaj si rozne cisla alebo si urob program aby ti preskusal vsetky mozne cisla a vypisal ked to pri niektorom bude nespravne, a napis jak si dopadol :)The x87 Floating Point Unit
The x87 FPU knows 4 rounding modes (see the FPU control word section of this article). So how does the FPU round? Say an operation on a Single produced an intermediate result that has some extra low bits. The extended mantissa looks like this:
1.0001 1100 0100 1100 1001 0111
The underlined bit is the bit to be rounded. There are two possible values this can be rounded to, the value directly below and the value directly above:
1.0001 1100 0100 1100 1001 011
1.0001 1100 0100 1100 1001 100
Now what happens depends on the rounding mode. If the rounding mode is the default — round to nearest “even” — it will get rounded to the value that has a 0 as least significant bit. You can probably guess which of the two values is chosen for the other rounding modes.