Yixuan Huang <yixuan178@xxxxxxxxx> writes: > I want to know where can I find include header files in iostream? Or > is there some way to search it fast? I searched in > /usr/include/c++/4.1.2, but can't find it. Can you help? I don't entirely understand what you are saying. I would expect that <iostream> for gcc 4.1.2 would be in that directory, /usr/include/c++/4.1.2. Do you not see it there? What do you see in that directory? Ian