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CSE 2221 FINAL EXAM 2024 QUESTIONS AND ANSWERS $12.99   Add to cart

Exam (elaborations)

CSE 2221 FINAL EXAM 2024 QUESTIONS AND ANSWERS

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  • CSE 2221
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  • CSE 2221

CSE 2221 FINAL EXAM 2024 QUESTIONS AND ANSWERS

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  • September 7, 2024
  • 17
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • CSE 2221
  • CSE 2221
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Teacher101
CSE 2221 FINAL EXAM

What 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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