This documentation is archived and is not being maintained.

cerr 

Specifies the cerr global stream.


extern ostream cerr;

An ostream object.

The object controls unbuffered insertions to the standard error output as a byte stream. Once the object is constructed, the expression cerr.flags & unitbuf is nonzero.

// iostream_cerr.cpp
// compile with: /EHsc
// By default, cerr and clog are the same as cout
#include <iostream>
#include <fstream>

using namespace std;

void TestWide( ) 
{
   int i = 0;
   wcout << L"Enter a number: ";
   wcin >> i;
   wcerr << L"test for wcerr" << endl;
   wclog << L"test for wclog" << endl;   
}

int main( ) 
{
   int i = 0;
   cout << "Enter a number: ";
   cin >> i;
   cerr << "test for cerr" << endl;
   clog << "test for clog" << endl;
   TestWide( );
}

3
1

Enter a number: 3
test for cerr
test for clog
Enter a number: 1
test for wcerr
test for wclog

Header: <iostream>

Show: