This example tests whether you understand the integer promotion rules in C – an area that I find is very poorly understood by many developers.
The answer is that this program outputs “-20 > 6″. The reason for this is that expressions involving signed and unsigned types have all operands promoted to unsigned types. Thus -20 becomes a very large positive integer and the expression evaluates to greater than 6.
If you get this one wrong, then you are perilously close to not being hired.