Amazon Non Software Development Engineer interview questions

Had 2 phone interviews after posting my resume in Monster. Both were technical. All questions can be found in this site and most of them were about data structures. one of them is to design the elevator class. The interviewers were very nice and so was the recruiter. Over all it was positive.

The phone interview was preety simple, was asked basic concepts about oop and what projects i did, the next day i was called for a one on one interview and was asked to redesign a api that could take any type of string as input and convert it to a corresponding integer output, was then asked to return more than one variable from a function. was also asked to implement a basic system call