boost asio sync

Service:

#include<boost/asio.hpp>
#include<boost/thread.hpp>
#include<iostream>
#include<string>

using namespace std;
using namespace boost::asio;

int main()
{
    io_service ios;
    ip::tcp::acceptor acceptor(ios,ip::tcp::endpoint(ip::tcp::v4(),));

    while()
    {
        ip::tcp::socket socket(ios);
        acceptor.accept(socket);

        cout<<socket.remote_endpoint().address()<<endl;
        boost::system::error_code ec;

        string message;

        cout<<"Please input a string:"<<endl;
        cin>>message;

        socket.write_some(buffer(message),ec);

        if(ec)
        {
            cout<<boost::system::system_error(ec).what()<<endl;
            break;
        }
    }        

    return ;
}

Client:

#include<iostream>
#include<boost/asio.hpp>

using namespace std;
using namespace boost::asio;

int main(int argc,char *argv[])
{
    io_service ios;
    ip::tcp::socket socket(ios);
    ip::tcp::endpoint endpoint(ip::address_v4::from_string("127.0.0.1"),);

    boost::system::error_code ec;
    socket.connect(endpoint,ec);

    if(ec)
    {
        cout<<boost::system::system_error(ec).what()<<endl;
        return -;
    }

    char buf[];

    size_t len=socket.read_some(buffer(buf),ec);
    cout.write(buf,len);
    cout<<"\n";

    getchar();
    return ;
}