string as iterable Cpp code example

Example 1: string iterator in c++

// string::begin/end
#include <iostream>
#include <string>

int main ()
{
  std::string str ("Test string");
  for ( std::string::iterator it=str.begin(); it!=str.end(); ++it)
    std::cout << *it << endl;
  std::cout << '\n';

  return 0;
}

Example 2: declaring iterator in cpp

vector<int>::iterator ptr;