how to get reverse iterator in c++ code example

Example 1: reverse iterator c++

// A reverse_iterator example using vectors

#include <iostream>
#include <vector>

int main() {
	std::vector<int> vec = {1, 2, 3, 4, 5};
  	std::vector<int>::reverse_iterator r_iter;
  
    // rbegin() points to the end of the vector, and rend()
    // points to the front. Use crbegin() and crend() for
  	// the const versions of these interators.
    for (r_iter = vec.rbegin(); r_iter != vec.rend(); r_iter++) {
        std::cout << *r_iter << std::endl;
    }
  	
  	return 0;
}

Example 2: string reverse iterator c++

// string::rbegin/rend
#include <iostream>
#include <string>

int main ()
{
  std::string str ("now step live...");
  for (std::string::reverse_iterator rit=str.rbegin(); rit!=str.rend(); ++rit)
    std::cout << *rit;
  return 0;
}