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C ++ dynamic array without STL

This is part of the assignment, but I just ask you to clarify:

Download data from ATM.txt and save it in a dynamic array (type ATM, not STL) when the program starts.

How can I make dynamic arrays without STL? I thought that perhaps assignment means using pointers, "ATM Type" threw me away.

He mentioned again:

accounts.txt file into a dynamic array (account type, not STL)

- is not part of the destination

I never understood the use of unsafe memory operations, for example, pulling the number of elements in a file from the first line:

eg.

5
abc
def
hij
kml
mno

Wouldn't it be wiser to use STL (vectors or C ++ 11 arrays) and not rely on the number in the file, since it may be inaccurate, causing a buffer overflow, etc.?

// Account.h, : id, BSB ..

, ATM.

+5
5

- , new[], delete[]:

ATM * atms = new ATM[count];
// do stuff with the array
delete [] atms;

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: http://www.cplusplus.com/doc/tutorial/dynamic/

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