vector rbegin() and rend() function in C++ STL

vector::rbegin() is a built-in function in C++ STL which returns a reverse iterator pointing to the last element in the container.

Syntax:

vector_name.rbegin()

Parameters: The function does not accept any parameter.

Return value: The function returns a reverse iterator pointing to the last element in the container.

Program to demonstrate the vector::rbegin() method:

Program 1:

// CPP program to illustrate 
// the vector::rbegin() function 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    vector<int> v; 
    v.push_back(11); 
    v.push_back(12); 
    v.push_back(13); 
    v.push_back(14); 
    v.push_back(15); 
  
    // prints all the elements 
    cout << "The vector elements in reverse order are:\n"; 
    for (auto it = v.rbegin(); it != v.rend(); it++) 
        cout << *it << " "; 
    return 0; 
} 

Output:

The vector elements in reverse order are:
15 14 13 12 11

vector::rend() is a built-in function in C++ STL which returns a reverse iterator pointing to the theoretical element right before the first element in the array container.

Syntax:

vector_name.rend()

Parameters: The function does not take any parameter.

Return value: The function returns a reverse iterator pointing to the theoretical element right before the first element in the array container.

Program to demonstrate the vector::rend() method:

Program 1:

// CPP program to illustrate 
// the vector::rend() function 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    vector<int> v; 
    v.push_back(11); 
    v.push_back(12); 
    v.push_back(13); 
    v.push_back(14); 
    v.push_back(15); 
  
    cout << "The last element is: " << *v.rbegin(); 
  
    // prints all the elements 
    cout << "\nThe vector elements in reverse order are:\n"; 
    for (auto it = v.rbegin(); it != v.rend(); it++) 
        cout << *it << " "; 
    return 0; 
} 

Output:

The last element is: 15
The vector elements in reverse order are:
15 14 13 12 11

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