Simplest way to check if two integers have same sign?

Question

Which is the simplest way to check if two integers have same sign? Is there any short bitwise trick to do this?

Answer 1

(integer1 * integer2) > 0

Because when two integers share a sign, the result of multiplication will always be positive.

You can also make it >= 0 if you want to treat 0 as being the same sign no matter what.