William "Chops" Westfield wrote:

> [...] and it certainly ought to be true that: 
> 
> (ptr + i) - (ptr) == i; 

While in essence you're right, this argument doesn't always work -- so you
still have to know when it does and when not, and as such it doesn't
explain much (as it's the result of already knowing :). 

For example you shouldn't bet anything of value that this is true:

  (doubleVal + intVal) - (doubleVal) == intVal;

(Of course, we know why that's different and why the first one works and
the second one not, but I just wanted to point out that math and
programming instructions are not the same.)

Gerhard

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