File Streams:

4   A file stream is a group bytes associated with files.

4   Input file stream allows us to read contents from a file.

4   Output file stream allows us to write contents into a file.

4   To perform read/write from/to files, we need to use file I/O stream classes.

4   C++ provides several system defined File I/O stream classes.

4   All these classes are defined in “fstream.h”.

4   List of File I/O streams is given below:

Class	Derived From	purpose
ifstream	istream, fstreambase	Opens a file in input mode
ofstream	ostream, fstreambase	Opens a file in output mode
fstream	iostream, fstreambase	Opens a file in input/output  mode