Reverse Integer

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321

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Have you thought about this?
Here are some good questions to ask before coding. Bonus points for you
if you have already thought through this!

If the integer's last digit is 0, what should the output be? ie, cases
such as 10, 100.

Did you notice that the reversed integer might overflow? Assume the
input is a 32-bit integer, then the reverse of 1000000003 overflows. How
should you handle such cases?

Throw an exception? Good, but what if throwing an exception is not an
option? You would then have to re-design the function (ie, add an extra
parameter).