What will C++ do now?

void quiz(){
    std::string s("1");

    {
        std::istringstream exp(s);
        exp.ignore();
        std::cout << "1)" << "\t" << exp.eof() << "\t" << (exp.peek() == EOF) << std::endl;
    }

    {
        std::istringstream exp(s);
        exp.ignore();
        std::cout << "2)" << "\t" << (exp.peek() == EOF)  << "\t" << exp.eof() << std::endl;
    }

    {
        std::istringstream exp(s);
        exp.ignore();
        char c = '0';
        std::cout << "3)" << "\t" << (c = exp.peek(), c);
        std::cout << "\t" << (exp >> c, c) << std::endl;
    }

    {
        std::istringstream exp(s);
        char c = '0';
        std::cout << "4)" << "\t" << (exp >> c, c);
        std::cout << "\t" << (exp >> c, c) << std::endl;
    }

    {
        std::istringstream exp(s);
        exp.ignore();
        char c = '0';
        std::cout << "5)" << "\t" << (exp >> c, c);
        std::cout << "\t" << (c = exp.peek(), c) << std::endl;
    }

}