iostream is a libary that work on the standard way(way=namespace) (std=standard), every libay that doesnt work that way has the (.h) at the end , that why when you will see (include<windows.h>) and the user used a functions from the (windows.h) he altought used the ("using namespce std;")
lets say that everything that ISNT std ' the compiler read it in other way , or he dont read it at all and he tell the user that there was a problem in compiling this program !
I m a C++ hacker , but , i geuss you have a book of C or C++ in your home !
that books are telling you (almost all of the book) a functions from 1-3 libarys , my tip is you to learn it But to be consetret on how does the C and C++ work (?) !
i mean , if you want to know a knew things you may go to other libarys and search there for a new functions , you have to read EVERY line to know what they did in the other line ! (that other line could be in the more 1000 lines , )
its hard but good luck with it
