iostream library provides hundreds of I/O capabilities. Several headers contain portions of the library interface.
Most C++ programs include the
<iostream> header, which declares basic services required for all stream-I/O operations. The
<iostream> header defines the
clog objects, which correspond to the standard input stream, the standard output stream, the unbuffered standard error stream and the buffered standard error stream, respectively. (
clog are discussed in Section 13.2.3.) Both unformatted and formatted-I/O services are provided.
<iomanip> header declares services useful for performing formatted I/O with so-called parameterized stream manipulators, such as