for argument `1' to `int strcmp(const char*, const char*)

["learning c++" <learning_c@xxxxxxxxxxx>]

Hi,
I hope to use the build in function ""strcmp()" in C++, but I can not deal 
with it. My code is like this:

#include <iostream>
#include <string>
#include <cstring>
#include <vector>
using namespace std;

int main(){
vector<string> v1;
vector<string>::iterator iter;
string s;
do{
cout <<"please input something:" <<endl;
cin>>s;
v1.push_back(s);
}while (!(strcmp(s,"quit")));

for(iter=v1.begin(); iter!=v1.end();iter++)
cout <<*iter<<endl;

return 0;
}

error: cannot convert `__gnu_cxx::__normal_iterator<char*,
  std::basic_string<char, std::char_traits<char>, std::allocator<char> > >' 
to
  `const char*' for argument `1' to `int strcmp(const char*, const char*)'

I know now "s" is an object of string. How can I compare it with a string, 
like ""quit"? Are there some methods in String class?

Thanks,

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