The array works crookedly, what's the problem?

Question

C++ / C#

I need to fill and display an array, but not all elements are filled and it also doesn’t display everything, which I did wrong, here is the code and the output in the console:

Answer 1

You are trying to define A[n] even though n is not yet initialized and can have any arbitrary value.
Well, in C/C++ array indexes start from zero, not from one.