<istream>
The <istream> header declares the input stream classes, templates, and
an input manipulator.
Note
istream is declared in
<istream>, and ostream is declared in <ostream>, but iostream is declared in <istream>, not <iostream>.
See <fstream> for
derived-class templates that read from files and <sstream> for derived-class templates
that read from strings. See <ios> for the base-class declarations.
Refer to Chapter 9 for general
information about I/O.
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