what the interviewee's really wanted to know was your thought process in descrption the implementation, as your write, say what you are thinking in order to get a conversation going w/ the audience. In my case, we ended up on a whole tangent about what if the memory you are trying to copy is already occupied, which led to memmove() which ultimately sparked a conversation among the group, i.e. a more positive engagement versus just going up to the whiteboard in silence.