Answers for "iostream in c++ means"

iostream library in cpp

// iostream_cerr.cpp
// compile with: /EHsc
#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( );
}

stringstream in c++

- A stringstream associates a string object with a stream allowing 
you to read from the string as if it were a stream (like cin).
- Method:
 clear() — to clear the stream
 str() — to get and set string object whose content is present in stream.
 operator << — add a string to the stringstream object.
 operator >> — read something from the stringstream object,