The Fstream.h Header File
In C++, file input/output facilities are implemented through a component header file of C++ standard library. This header file is fstream.h. The fstream library predefines a set of operations for handling file related input and output. It defines certain classes that help one perform file input and output. For example, ifstream class ties a file to the program for input; ofstream class ties a file to the program for output; and fstream class ties a file to the program for both input and output. The classes defined inside fstream.h derive from classes under iostream.h, the header file that manages console I/O operations in C++. Following figure shows the stream class hierarchy.
The functions of these classes have been summarised in the following table:
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