checking for overflow in C

[Rahul Dhesi]

Just a reminder to all of you:  "Overflow" simply does not exist in
unsigned arithmetic.  When you add two unsigned values and the result
is too big to fit, what happens is a "carry", not an overflow.
Overflow occurs only in signed arithmetic.
-- 
Rahul Dhesi <dhesi at bsu-cs.bsu.edu>
UUCP:    ...!{iuvax,pur-ee}!bsu-cs!dhesi