#include <sstream>
#include <iostream>

using namespace std;

int main(int argc, char** argv)
{
    const char* cs = "line1\nline2\nline3";

    stringstream ss(cs);

    for (int i = 0; i < 2; ++i)
    {
        streamoff pos = ss.tellg();
        string s;
        getline(ss, s);
        cout << s << endl;
        cout << "**" << endl;
        cout << pos << endl;
    }

    cout << endl << "------------------------------------------" << endl << endl;

    for (int i = 0; i < 2; ++i)
    {
        streamoff pos = ss.tellg();
        string s;
        getline(ss, s);
        cout << s << endl;
        cout << "$$" << endl;
        cout << pos << endl;
        ss.seekg(pos, ios::beg);
    }

    return 0;
}