new operator - Difference in creating an object in C++ using new keyword and not -

i'm new c++ want know difference between statements:

note: enemy base class of ninja class

ninja n; enemy * enemy = &n;

and

enemy * enemy = new ninja;

i want know when should use of statements in case have difference.

when this:

ninja n;

you allocate ninja on stack , this

enemy * enemy = &n;

gets pointer location. once leave current function, memory in stack reused , ninja* dangling: if try access (dereference) program crash or worse.

when this:

enemy * enemy = new ninja;

you allocate new ninja object on heap. can continue yo use ninja instance until free memory

delete enemy;

check out answers this question better idea of stack vs heap allocation.

Silver