Interview question

1. use of volatile 

http://www.programmersheaven.com/article/7256-Use+of+Volatile+in+C+programming+Language/info.aspx

http://publications.gbdirect.co.uk/c_book/chapter8/const_and_volatile.html\

http://en.wikibooks.org/wiki/Embedded_Systems/C_Programming

2. storage class in c programming

3. code optimizations 

SIMD, loop unrolling, parallelizing, pipelining

4. Radix tree

5. Spin lock and mutex