#include <iostream>
#include <string.h>// cstring 
using namespace std;
// string_at_iteration1.cpp
int main()
{
	
	string str1 ( "Hello World" ), str2 ( "Goodbye world" );

	  // Element access to the non const strings
	     basic_string <char>::reference Str1 = str1 [6];
	     basic_string <char>::reference Str2 = str1.at ( 6);
	     cout<<"\n str1 [6]; \t"<<  Str1 << endl;
	     cout<<"\n str1.at ( 6);\t"<<  Str2 << endl;
	     string str ("Hello World");
	       for (size_t i=0; i < str.length(); i++)
	       {
	         cout <<"\n @ "<< i <<"\t:"<< str.at(i) ;
	       }

	 return 0;
}