Re: GNAT messages and the not operator (pitfall alert!)

[dewar@merv.cs.nyu.edu (Robert Dewar)]

iMatt asks

"Relative to the page 245 warning and the table on page 246, I'm still confused.
I'm probably beating a dead horse here, but something still doesn't seem right.
If I'm reading the p. 246 table correctly, -5 mod 4 (row 1, column 4, excluding
the "header row and column"), should evaluate to 3.  However, I just wrote a
simple little program using ObjectAda V7.0 which evaluates to -1, which, BTW,
is what I would have expected.  Taking into account the warning on p. 245, I
also tried -(5 mod 4).  It does give the identical -1 result.  Am I reading the
table incorrectly?"

Yes, you are beating a dead horse :-)

The table does not tell you what happens if you write -5 mod 4 , it tells
you the result of the mod operation if the left operand is -5 and the 
right operand is 4. The WHOLE POINT OF THE ORIGINAL POST is that these
are different!