Huawei Technologies Engineer interview questions

The first interview was totally based on C/C++ in which i was asked to write code for atoi() function, dat was a simple one. Then he asked me to write some hexadecimal conversion and few more things. That round got cleared and i was asked to come back for the next round the other day. The next interview was supposedly tougher where i was asked comp. architecture concepts and some code's output and to correct the code.