C++ Pointer access character within string via pointer

#include <iostream>

using namespace std;

int main()//from   w w w.  j  ava 2 s.  c o  m
{
  string s;
  string *ptrToString;

  s = "this is a test from  book2s.c o m";
  ptrToString = &s;

  for (unsigned i = 0; i < s.length(); i++){
    cout << (*ptrToString)[i] << " ";
  }

  cout << endl;
  return 0;
}