Stacks are declared as an "abstract" class. They are currently implemented in any of three ways.
All possess the same capabilities. They differ only in constructors. VStack constructors require a fixed maximum capacity argument. XPStack constructors optionally take a chunk size argument. SLStack constructors take no argument.
Assume the declaration of a base element
Stack s; or Stack s(int capacity)
x = s.pop()
top()to inspect and use the top of stack, followed by a
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