cerr

Library:  Input/output

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Predefined stream that controls output to a stream buffer associated with the object stderr declared in <cstdio>

#include <iostream>

namespace std {
  extern ostream cerr;
}

The object cerr controls output to a stream buffer associated with the object stderr declared in <cstdio>. By default, the standard C and C++ streams are synchronized, but you can improve performance by using the ios_base member function synch_with_stdio to desynchronize them.

The formatting is done through member functions or manipulators. See cout or basic_ostream for details.

basic_ostream, basic_iostream, basic_filebuf, cout, cin, clog, wcin, wcout, wcerr, wclog, ios_base, basic_ios

ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 27.3.1