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set::rbegin() and set::rend() in C++ STL

Last Updated : 19 Jun, 2018
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  1. set::rbegin() is a built-in function in C++ STL which returns a reverse iterator pointing to the last element in the container. Syntax: 
    reverse_iterator set_name.rbegin()
    Parameters: The function does not take any parameter. Return value: The function returns a reverse iterator pointing to the last element in the container. Program to demonstrate the set::rbegin() method: Program 1: CPP 
    // CPP program to demonstrate the
// set::rbegin() function
#include <bits/stdc++.h>
using namespace std;
int main()
{

    int arr[] = { 14, 12, 15, 11, 10 };

    // initializes the set from an array
    set<int> s(arr, arr + 5);

    set<int>::reverse_iterator rit;

    // prints all elements in reverse order
    for (rit = s.rbegin(); rit != s.rend(); rit++)
        cout << *rit << " ";

    cout << "\nThe last element in set is " << *(s.rbegin());

    return 0;
}
    Output: 
    15 14 12 11 10 
The last element in set is 15

  2. set::rend() in an inbuilt function in C++ STL which returns a reverse iterator pointing to the theoretical element right before the first element in the set container. Syntax: 
    reverse_iterator set_name.rend()
    Parameter: The function does not accepts any parameter. Return value: The function returns a reverse iterator pointing to the theoretical element right before the first element in the set container. Below programs illustrate the function: Program 1: CPP 
    // CPP program to demonstrate the
// set::rend() function
#include <bits/stdc++.h>
using namespace std;
int main()
{

    int arr[] = { 4, 3, 5, 1, 2 };

    // initializes the set from an array
    set<int> s(arr, arr + 5);

    set<int>::reverse_iterator rit;

    // prints all elements in reverse order
    for (rit = s.rbegin(); rit != s.rend(); rit++)
        cout << *rit << " ";

    return 0;
}
    Output: 
    5 4 3 2 1

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Twinkl Bajaj
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