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array::rbegin() and array::rend() functions with Example in C++ STL

C++ STL | array::rbegin() and array::rend() functions: Here, we are going to learn about the array::rbegin() and array::rend() functions of Array in C++ STL.
Submitted by IncludeHelp, on March 01, 2019

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

array::rbegin() function is a library function of array and it is used to get the first element (from reverse side) of the array, it returns a reverse iterator pointing to the last element of the array.

array::rend() function is a library function of array and it is used to get the last element (from reverse side i.e. first element) of the array, it returns a reverse iterator pointing to the last element of the array.

Syntax

array::rbegin();
array::rend();

Parameter(s)

None

Return value

The function returns reverse iterators pointing to the first and last elements of an array.

Sample Input and Output

Input or array declaration:
array<int,5> arr {10, 20, 30, 40, 50};

Function call:
auto it=arr.rbegin();
cout<<*it;
it=arr.rend();
cout<<*it;

Output:
50 10

Example

C++ STL program to demonstrate example of array::rbegin() and array::rend() functions:

#include <array>
#include <iostream>
using namespace std;

int main() {
  array<int, 5> numbers{10, 20, 30, 40, 50};
  array<string, 5> cities{"New Delhi", "Mumbai", "Gwalior"};

  cout << "Elements of numbers array..." << endl;
  for (auto it = numbers.rbegin(); it != numbers.rend(); it++)
    cout << *it << " ";
  cout << endl;

  cout << "Elements of cities array..." << endl;
  for (auto it = cities.rbegin(); it != cities.rend(); it++) cout << *it << " ";
  cout << endl;

  return 0;
}

Output

Elements of numbers array...
50 40 30 20 10
Elements of cities array...
Gwalior Mumbai New Delhi