Because destructor cleans up in the reverse order.

We can dynamically allocate arrays of primitive types using new as well

This calls the copy constructor

Related to

C++ requires that all classes must provide certain operations

If you don’t provide them, the compiler will make them up by following some simple rules. This can lead to problems

http://www.cs.caltech.edu/courses/cs11/material/cpp/donnie/lectures/cs11-cpp-lec2.pdf