checking for overflow in C

[Henry Spencer]

In article <11538 at ulysses.homer.nj.att.com> ggs at ulysses.homer.nj.att.com (Griff Smith) writes:
>... After doing an `add' that causes overflow, it's
>a bit late to tell the hardware that you were doing an unsigned add.
>Preventing the overflow is often an expensive operation.

Then C's unsigned arithmetic will be expensive on that machine.  Unsigned
arithmetic in C is *required* to be non-overflowing.
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