how to dynamically declare array in cpp code example

Example 1: declare dynamic array c++

int main()
{
  int size;

  std::cin >> size;

  int *array = new int[size];

  delete [] array;

  return 0;
}

Example 2: c++ allocate dynamic with initial values

int length = 50;
int *array = new int[length]();
// returns 50 length array of 0