The Function of I/O library – iostream.h
At the lowest implement level , where the
notion of data type is missing and files are treated as streams ob bytes , the
I/O library manages the transfer of these bytes.
At the user level , where the notion of
data type is present , I/O library manages the interface between these two
levels i.e , between user level and the lowest implementations level.
The I/O library predefines a set of operations for handling
reading and writing of built-un data types.