How to multiply two ints and check

[Doug Gwyn]

In article <4700038 at m.cs.uiuc.edu> robison at m.cs.uiuc.edu writes:
>There is a much simpler, faster, and machine-independent way to check
>for multiplication overflow --- check the product by division.  ...

Nope, for portability you have to avoid signed-integer overflow in
the first place.  The overflow might (and does in some implementations)
cause an ABEND.