The use of an **array** is very restricted since its length has to be known at
compile time. On the other hand, the flexibility of a **seq** which can change
its length during its lifetime and which can even be reallocated at lifetime,
is not necessary in many cases.
Many applications read the _dimensions_ of a problem at runtime, but then
_arrays_ have fixed sized after their definition. It's posiible in C++ like
int getdimension();
...
int N = getdimension();
double A[N];
Run
What to do in Nim in that case?
