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#include <iostream>
#include <vector>
#include <string>

using namespace std;

main()
{
   vector<string> stringVec;

   stringVec.push_back("The number is 10");
   stringVec.push_back("The number is 20");
   stringVec.push_back("The number is 30");

   cout << "Loop by index:" << endl;

   int ii;
   for(ii=0; ii < stringVec.size(); ii++)
   {
      cout << stringVec[ii] << endl;
   }

   cout << endl << "Constant Iterator:" << endl;

   vector<string>::const_iterator cii;
   for(cii=stringVec.begin(); cii!=stringVec.end(); cii++)
   {
      cout << *cii << endl;
   }

   cout << endl << "Reverse Iterator:" << endl;

   vector<string>::reverse_iterator rii;
   for(rii=stringVec.rbegin(); rii!=stringVec.rend(); ++rii)
   {
      cout << *rii << endl;
   }

   cout << endl << "Sample Output:" << endl;

   cout << stringVec.size() << endl;
   cout << stringVec[2] << endl;

   swap(stringVec[0], stringVec[2]);
   cout << stringVec[2] << endl;
}