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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_string_rend.htm below:

C++ String Library - rend

It return reverse iterator to reverse end.

Following is the declaration for std::string::rend.

reverse_iterator rend();
const_reverse_iterator rend() const;

reverse_iterator rend() noexcept;
const_reverse_iterator rend() const noexcept;

none

It returns a reverse iterator to the reverse end of the string.

Never throw any exceptions.

In below example for std::string::rend.

#include <iostream>
#include <string>

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

The sample output should be like this −

...tnioP slairotuT 

string.htm

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