Re: [avr-gcc-list] [Bug] float: 0/0 =2

[Dave Hansen]

From: Bjarne Laursen <address@hidden>

> I discovered another bug in the float libary:
>
>     {
>         volatile float a;
>         volatile float b;
>         volatile float c;
>         a=0;
>         b=0;
>         c= b/a; // divide returns 0x40000000 (2.0)
>     }

That's not technically a bug.  At least, not in avr-gcc.

According to n869 6.5.5p5, if the right-hand operand of either the "/" or 
"%" operators has the value zero, the behavior is undefined.  Undefined 
behavior may include behavior you expect (perhaps +Inf or NaN), but it may 
include behavior you do not expect (such as 2.0 or nasal demons).

Regards,
  -=Dave

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