Code: Select all
a.l=b.f*c.l+1.5+9
Debug a ;debugs 10
a.l=b.f*c.l+1.5+90
Debug a ;debugs 92
Floats bug, or feature?
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Killswitch
- Enthusiast
- Posts: 731
- Joined: Wed Apr 21, 2004 7:12 pm
Floats bug, or feature?
Just messing about with PB but I've noticed this:
Why is 1.5 being rounded to 1 in the first case, but 2 in the second?
~I see one problem with your reasoning: the fact is thats not a chicken~
The multiplication has nothing do to with it:
Purebasic correctly adds the float constants together:
Conclusion: The FPU FISP instruction (store a float number to an integer) uses banker's rounding mode.
Code: Select all
a.l = b.f + 1.5 + 9
Debug a ;debugs 10
a.l = b.f + 1.5 + 10
Debug a ;debugs 12Code: Select all
PokeL(@a.f, 1093140480)
Debug a ; 10.5
PokeL(@a.f, 1094189056)
Debug a ; 11.5