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

  • Difficulty Level : Easy
  • Last Updated : 30 Oct, 2019
  1. array::rbegin() is a built-in function in C++ STL which returns a reverse iterator pointing to the last element in the container.

    Syntax:

    array_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 array::rbegin() method:

    Program 1:




    // CPP program to illustrate
    // the array::rbegin() function
    #include <bits/stdc++.h>
    using namespace std;
      
    int main()
    {
        // array initialisation
        array<int, 5> arr = { 1, 5, 2, 4, 7 };
      
        // prints the last element
        cout << "The last element is " << *(arr.rbegin()) << endl;
      
        // prints all the elements
        cout << "The array elements in reverse order are:\n";
        for (auto it = arr.rbegin(); it != arr.rend(); it++)
            cout << *it << " ";
      
        return 0;
    }
    Output:
    The last element is 7
The array elements in reverse order are:
7 4 2 5 1

  2. array::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:
    array_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 array::rend() method:
    Program 1:



    // CPP program to illustrate
    // the array::rend() function
    #include <bits/stdc++.h>
    using namespace std;
      
    int main()
    {
        array<int, 5> arr = { 1, 5, 2, 4, 7 };
      
        // prints all the elements
        cout << "The array elements in reverse order are:\n";
        for (auto it = arr.rbegin(); it != arr.rend(); it++)
            cout << *it << " ";
        return 0;
    }
    Output:
    The array elements in reverse order are:
7 4 2 5 1


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How to reverse an Array using STL in C++?
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gopaldave
@gopaldave
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