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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_array_crbegin.htm below:

C++ crbegin() Function

The C++ std::array::crbegin() function is used to return a constant iterator pointing to the last element of the array, allowing traversal in reverse order. Unlike rbegin(, the iterator returned by crbegin() is constant, meaning the elements it points to cannot be modified.

Following is the syntax for std::array::crbegin() function.

const_reverse_iterator crbegin() const noexcept;

It does not accepts any parameter.

This function returns a constant reverse iterator which points to the last element of the array.

This function never throws exception.

Constant i.e. O(1)

In the following example, we are going to consider the basic usage of the crbegin() function.

#include <iostream>
#include <array>
using namespace std;
int main(void) {
   array < int, 5 > arr = {10,20,30,40,50};
   for (auto it = arr.crbegin(); it != arr.crend(); ++it)
      cout << * it << " ";
   cout << endl;
   return 0;
}

Output of the above code is as follows −

50 40 30 20 10

Consider the following example, where we are going to apply the crbegin() function on the character array.

#include <iostream>
#include <array>
using namespace std;
int main() {
   array < char, 6 > MyArray {'P','R','A','S','U','N'};
   array < char, 6 > ::const_reverse_iterator crit;
   for (crit = MyArray.crbegin(); crit != MyArray.crend(); ++crit)
      cout << * crit << " ";
   return 0;
}

Following is the output of the above code −

N U S A R P 

In the following example, we are going to use the crbegin() function on the string array.

#include <iostream>
#include <array>
using namespace std;
int main() {
   array < string, 3 > MyArray {"Tutorials","point","company"};
   array < string, 3 > ::const_reverse_iterator crit;
   for (crit = MyArray.crbegin(); crit != MyArray.crend(); ++crit)
      cout << * crit << " ";
   return 0;
}

If we run the above code it will generate the following output −

company point Tutorials

array.htm

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