The results can be different, so OR and + are not truly interchangeable. 
Consider:

x=1
y=3
z1 = x Or y
z2 = x + y

? z1, z2
> 3        4

OR (and AND) are logical operators which in conjunction with grouping 
parentheses, can be used to build sophisticated logical expressions.  On 
numeric values OR performs what is called a "bitwise disjunction"
on the two 
numeric values.  This makes it handy for comparisons such as:

w=5
x=1
y=3

if (x or w) < (y or w) then...

as:

Debug.Print (x Or w) < (y Or w),
Debug.Print (x + w) < (y + w)

Debug.Print (x Or w), (y Or w)
Debug.Print (x + w), (y + w)

> True    True
    5             7
    6             8





-- 

Randy Birch
MVP Visual Basic
http://vbnet.mvps.org/
Please respond only to the newsgroups so all can benefit.


"Dan."  wrote in message
news:c9sl7j$elp$1{at}news.tiscali.fr...
: hi, i'm sorry to bother you; but i was wondering what the function of the 
OR
: operator was in terms of numbers:
:
:     num0 = num1 or num2
:
: i wrote me a little thing to try and see the effects and if the numbers 
are
: close, they add up; if they're real far apart, it gives the bigest only, 
and
: sometimes it gives the biggest +1 or +2.
:
: could someome please confirm the effects.
: thanks in advance
:     Dan.
:
:
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