Re: How to make a floating point value part of an activity

[Kevin Crowston]

>(Now that I think about this, I don't really understand why this is so. Does
>anybody know?  Are the floats are implicitly being converted to doubles by C
>or Obj C?  ints and pointers are both 32 bits on most machines, and
>floats are always 32 bits if they're IEEE single precision...)

I wondered about this too (see my earlier postings about storing floats in
Arrays) so I reread the section on type conversion in the C manual (I
assume the same rules apply in ObjC).  I had assumed that you could cast
any 32-bit item to any other by simply reinterpreting the bits, but not so.
Only int to pointer is allowed and supported; float to pointer is
explicitly ruled out.  You're not even allowed to cast a float into a
pointer.

In the case of sending a message, sending a pointer to float seems like the
best approach, rather than hacking around trying to make a float look like
an id.

Kevin



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