请问一下clog 的问题

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恩````去看看````

clogSee Also
<iostream> Members | ostream
Specifies the clog global stream.

extern ostream clog;
Return Value
An ostream object.

Remarks
The object controls buffered insertions to the standard error output as a byte stream.

Example
See cerr for an example of using clog.

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cerrSee Also
<iostream> Members | ostream
Specifies the cerr global stream.

extern ostream cerr;
Return Value
An ostream object.

Remarks
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.

Example
// 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( );
}
Input
3
1
Sample Output
Enter a number: 3
test for cerr
test for clog
Enter a number: 1
test for wcerr
test for wclog