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Showing content from https://www.tutorialspoint.com/cpp_standard_library/iostream.htm below:

C++ iostream

C++ Library - <iostream> Description

It is used in standard Input / Output Streams Library.

Declaration

Following is the declaration for iosstream function.

C++98 
Including this header may automatically include other headers, such as <ios>,
   <streambuf>, <istream>, <ostream> and/or <iosfwd>.
C++11 
Including <iostream> automatically includes also <ios>, <streambuf>, <istream>,
   <ostream> and <iosfwd>.
Objects

The objects of iosstream should be like this −

Narrow characters (char) Sr.No. Characters Definition 1 cin Standard input stream 2 cout Standard output stream 3 cerr Standard output stream for errors 4 clog Standard output stream for logging Wide characters (wchar_t) Sr.No. Characters Definition 1 wcin Standard input stream (wide) 2 wcout SStandard output stream (wide) 3 wcerr Standard output stream for errors (wide-oriented) 4 wclog Standard output stream for logging (wide)

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