View Compilation Error

0_0_38992892_29328.cpp: In function 'void collatz(DynamicArray&, int)':
0_0_38992892_29328.cpp:24:33: error: 'int DynamicArray::size' is private within this context
   24 |         for (int j = 0; j < arr.size; ++j) {
      |                                 ^~~~
0_0_38992892_29328.cpp:6:9: note: declared private here
    6 |     int size;
      |         ^~~~