Tough and interesting. Mostly indepth questioning about C programs, their outputs, why it is so, Compiler quirks etc ... Interviewers were very friendly and interview was more of a hands-on approach. You will be given a laptop and the interviewer can see your screen mirrored on his laptop. All the programs will be preloaded on your laptop. The you are asked to read one of the programs and tell the output. If answer is correct, you need to explain why ... and further indept questions will be asked.