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

C++ Array Data

The C++ std::array::data() function provides a direct pointer to the underlying array used by a array container. This function returns a pointer to the first element of the array, allowing access to the internal data.

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

value_type* data() noexcept;
const value_type* data() const noexcept;

It does not accepts any parameter

It returns a pointer to the data contained by the array object.

This function never throws exception.

Constant i.e. O(1)

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

#include <iostream>
#include <array>
using namespace std;
int main(void) {
   array < char, 128 > s = {"C++ standard library from tutorialspoint.com"};
   char * p, * q;
   p = s.data();
   cout << p << endl;
   q = p;
   while ( * q) {
      cout << * q;
      ++q;
   }
   cout << endl;
   return 0;
}

Output of the above code is as follows −

C++ standard library from tutorialspoint.com
C++ standard library from tutorialspoint.com

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

#include <iostream>
#include <array>
using namespace std;
int main() {
   array < int, 10 > arr = {9,12,15,18,21,24,27,30,33,36};
   cout << "The array elements are ";
   for (auto it = arr.begin(); it != arr.end(); it++)
      cout << * it << " ";
   auto it = arr.data();
   cout << "\nThe first element = " << * it;
   it++;
   cout << "\nThe second element = " << * it;
   it++;
   cout << "\nThe third element = " << * it;
   return 0;
}

Following is the output of the above code −

The array elements are 9 12 15 18 21 24 27 30 33 36 
The first element = 9
The second element = 12
The third element = 15

Let's look at the following example, where we are going to consider th character array and applying the data() function.

#include <iostream>
#include <array>
using namespace std;
int main() {
   array < char, 3 > x = {'a','n','u'};
   cout << "The array elements are = ";
   for (auto it = x.begin(); it != x.end(); it++)
      cout << * it << " ";
   auto it = x.data();
   cout << "\nThe first element = " << * it;
   return 0;
}

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

The array elements are = a n u 
The first element = a

array.htm

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