Initiation of the dynamic mass

How to initiate the dynamic mass of whole numbers (
int
When it's announced?

Create.
vector<int>
♪ He has a designer:explicit vector (size_type n, const value_type& val = value_type(), const allocator_type& alloc = allocator_type());
Give it the number of elements and the primary value.
Or you can put the initial values into this designer if you already have them:
template <class InputIterator> vector (InputIterator first, InputIterator last, const allocator_type& alloc = allocator_type());
The use of the vector will solve all your problems with changing the size of the dynamic mass in the future.
If you need a bare mass, you can fill it with zeros, recording it at the end of the box:
new int[n]();
Concrete values are maintained by modern compilators:
new int[n] { 1, 2 };