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A stack is implemented with an array of ‘A [0..N – 1]’ and a variable ‘pos’. The push and pop operations are defined by the following code.
push(x)
    A[pos] ← x
    pos ← pos – 1
end push
pop( )
   pos ← pos + 1
   return A[pos]
end pop
Q. Which of the following will initialize an empty stack with capacity N for the above implementation?
  • a)
    pos ← -1
  • b)
    pos ← 0
  • c)
    pos ← 1
  • d)
    pos ← N - 1
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A stack is implemented with an array of ‘A [0..N – 1]&rsqu...
For example, if we take an array with N = 4 to represent our stack. It will be A [0, 1, 2, 3].
Now, in order to push four elements, say x, y, z, w
  • First we will push at x index 3 which is 4 – 1
  • Then, we will decrement pos and push y at index 2 and so on.
Note that, the pop operation is also behaving inversely here.
  • In usual stack, pop would decrement value of pos.
In our case, pop is incrementing the value of pos.
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Most Upvoted Answer
A stack is implemented with an array of ‘A [0..N – 1]&rsqu...
For example, if we take an array with N = 4 to represent our stack. It will be A [0, 1, 2, 3].
Now, in order to push four elements, say x, y, z, w
  • First we will push at x index 3 which is 4 – 1
  • Then, we will decrement pos and push y at index 2 and so on.
Note that, the pop operation is also behaving inversely here.
  • In usual stack, pop would decrement value of pos.
In our case, pop is incrementing the value of pos.
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Question Description
A stack is implemented with an array of ‘A [0..N – 1]’ and a variable ‘pos’. The push and pop operations are defined by the following code.push(x) A[pos] ← x pos ← pos – 1end pushpop( ) pos ← pos + 1 return A[pos]end popQ. Which of the following will initialize an empty stack with capacity N for the above implementation?a)pos ← -1b)pos ← 0c)pos ← 1d)pos ← N - 1Correct answer is option 'D'. Can you explain this answer? for Computer Science Engineering (CSE) 2025 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about A stack is implemented with an array of ‘A [0..N – 1]’ and a variable ‘pos’. The push and pop operations are defined by the following code.push(x) A[pos] ← x pos ← pos – 1end pushpop( ) pos ← pos + 1 return A[pos]end popQ. Which of the following will initialize an empty stack with capacity N for the above implementation?a)pos ← -1b)pos ← 0c)pos ← 1d)pos ← N - 1Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A stack is implemented with an array of ‘A [0..N – 1]’ and a variable ‘pos’. The push and pop operations are defined by the following code.push(x) A[pos] ← x pos ← pos – 1end pushpop( ) pos ← pos + 1 return A[pos]end popQ. Which of the following will initialize an empty stack with capacity N for the above implementation?a)pos ← -1b)pos ← 0c)pos ← 1d)pos ← N - 1Correct answer is option 'D'. Can you explain this answer?.
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