Quick Signed Integer Question

Matthew Aurand · Joined: 20 Dec 2007 Posts: 9

Hey guys,

I am trying to convert a signed int to an unsigned int. What is the format of a signed int? I can't find the info in the compiler manual...

I am using 32-bit ints.

The MSB I assume is the sign bit, so if I want to convert say '-1000' to '1000' all I need to do is clear the MSB?

Thanks!

-Matt
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-Matthew A. Aurand

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

They are stored in two's complement format:
http://en.wikipedia.org/wiki/Two's_complement

The quick way to get the Absolute value (to code it) is to use the ABS()
function.

Sydney · Joined: 13 Feb 2009 Posts: 71

You could do:

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

With that method, he has to know ahead of time that the value is negative.
Or, he has to add a test (an if statement) to test if it's negative before
he does your code.

With the ABS() function, it works on either a positive or negative value.
You don't need to test it before you run the function on it.