Re: [Dev-C++] OT signed/unsigned

[Per W. <pw...@ia...>]

Actually, the two-complement format (that only stores one zero) uses the
extra value to store an extra negative value.

A two-bit signed integer would store the values -2, -1, 0, 1.

/Per W

On Fri, 9 Jun 2006, [ISO-8859-15] G=F6sta Ljungdahl wrote:

> One bit is consumed by the sign (+ or -) which means that if the
> variable is signed it's maximum absolute value is "about" half that of a
> corresponding unsigned variable. An example explained the "about":
> Two bit integer
> 00 01 10 11
>
> unsigned
> this would be:
> 0 1 2 3
>
> signed
> assuming MSB contains the sign and + <-> 1 this would be:
> -0 -1 +0 +1 but since we only need one zero one normally does something
> like this:
> -1 0 +1 +2 that is -0 is taken to mean +2 and +0 is taken to mean 0
> hence the "about".
>
>
>
>
>
>
> Erik Schmidt skrev:
> > what's the difference between a signed and unsigned variable
> >
> >
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