Range of 32 bit values
Range of 32 bit values
- Subject: Range of 32 bit values
- From: Luigi Castelli <email@hidden>
- Date: Thu, 5 Apr 2007 14:09:34 -0700 (PDT)
Hi there,
I am on a PowerBook 2.16 GHz Intel Core Duo running Mac OS 10.4.7.
I am writing a small application with Xcode.
I have declared a variable as a 32-bit signed int.
So, the range of this variable goes from -2147483648 to 2147483647.
I multiply big float values and - after being appropriately cast -
assign them to the above variable.
Example:
int value = (int)(32768. * 65536.) // (and bigger)
I just so happens that when the result of the multiplication exceed the
size of the value that a 32 bit int type variable is able to represent
the value is clipped to -2147483648. I have noticed that the cast
(either explicit or implicit) is what causes the value to be clipped,
because if I cast to a bigger value (i.e. 64 bit) then the value is
wrapped until the 64 bit maximum is reached. Then the value is clipped
again.
In any case for the algorithm I am developing I would like the int
value to be wrapped, not clipped. I would like after reaching the
value's maximum limit to go back and start again from its minimum.
Is there any flag I need to set in Xcode to achieve that or am I just
unaware of programming rules ? I remember in Codewarrior values were
always wrapped by default.
Thanks for any help or suggestion.
- Luigi
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