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CSE 2221 FINAL EXAM 2024 QUESTIONS AND ANSWERS
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CSE 2221 FINAL EXAM 2024 QUESTIONS AND ANSWERS
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CSE 2221 FINAL EXAMWhat are the three methods of the Stack Interface? - ANSWERS-top
replaceTop
flip
What mathematical model is Stack modeled by? - ANSWERS-Modeled by
mathematical string of T
How many constructors for Stack? - ANSWERS-only 1, which is empty, creates an
empty stack
What does the Stack method void push(T x) do? - ANSWERS-adds x to the top (left
end) of this
aliases reference x
updates this
ensures
this = <x> * #this
Why is the container class called Stack? - ANSWERS-It follows the same sort of
organization and manipulation type that a stack in the program execution would
perform LIFO (last-in-first-out)
,LIFO - ANSWERS-last in first out
How is a Stack different than the queue? - ANSWERS-it is like a "dual" A queue is
first in first out, while stack is last in first out
What are the three methods of StackKernel? - ANSWERS-push
pop
length
What does the stack method T pop() do? - ANSWERS-Removes and retursn the
entry at the top (left end of this)
updates this
requires this /= <>
ensures
#this = <pop> * this
What does the stack method int length() do? - ANSWERS-Reports the length of
this
ensures
length = |this|
, What does the stack method T top() do? - ANSWERS-Returns the entry at the top
(left end) of this
Aliases: reference returned by top
requires:
this /= <>
ensures
<top> is prefix of this
What does the stack method T replaceTop(T x) do? - ANSWERS-replaces top of
this with x, and returns the old top
aliases reference x
updates this
requires
this /= <>
ensures:
<replaceTop> is prefix of #this and
this = <x> * #this[1, |#this|)
What does the stack method void flip() do? - ANSWERS-reverses ("flips") this
updates this
ensures
this = rev(#this)
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