Re: Simple program to find average of 3 numbers

[Stuart Palin <stuart.palin@0.0>]

prashna wrote:

> O.K, I have changed line 12 to  AVG := (OBJ1+OBJ2+OBJ3)/3;
> But still it giving constraint error!!! :((

Having another look at your original posting, notice that
there is a difference between the way you have declared your
type and the way it is declared in Robert Eachus' example.

Do you get the exception with Robert's example?
If not what might be the underlying difference?

Think again about the points I raised earlier:

> You might also want to consider what values the intermediate
> calculation Obj_1+Obj_2+Obj_3 can take.

OK, the second sentence really applies to Robert's
example...
> In this instance because your type is constrained to a
> number which should be well within the bounds of integer
> you would not experience a problem.

What context might the expression be evaluated in in your
example?

(Think about 'base types' try ranges of 1..42 and 1..43
[with suitable initial values].  What interesting number
lies between 3*42 and 3*43?)

How might it be possible to detect a potential constraint
error at compile time rather than during execution?

--
Stuart Palin