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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();
Parameters: None
Return value: Function return reverse iterators pointing to the first and last elements of an array.
Example:
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
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