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Showing content from https://cplusplus.com/reference/array/array/front/ below:

public member function

<array>

      reference front();const_reference front() const;

Access first element

Unlike member array::begin, which returns an iterator to this same element, this function returns a direct reference.

Calling this function on an empty container causes undefined behavior.

If the array object is const-qualified, the function returns a const_reference. Otherwise, it returns a reference.

Member types reference and const_reference are the reference types to the elements of the array (see array member types).

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// array::front
#include <iostream>
#include <array>

int main ()
{
  std::array<int,3> myarray = {2, 16, 77};

  std::cout << "front is: " << myarray.front() << std::endl;   // 2
  std::cout << "back is: " << myarray.back() << std::endl;     // 77

  myarray.front() = 100;

  std::cout << "myarray now contains:";
  for ( int& x : myarray ) std::cout << ' ' << x;

  std::cout << '\n';

  return 0;
}

front is: 2
back is: 77
myarray now contains: 100 16 77

array::back

Access last element (public member function)

array::at

Access element (public member function)

array::operator[]

Access element (public member function)

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