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

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:

   
   
   
   
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   // 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; }

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   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:

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   // 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; }

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   Output:

   The array elements in reverse order are:
   7 4 2 5 1
   

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