QuestionQuestion

Use the operations push, pop, peek and empty to construct an operation which sets i to
the bottom element of the stack, leaving the stack unchanged. (hint: use an auxiliary stack and write in pseudocode.)

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Answer: assuming the current stack is called Stack, we follow the hint and engage a temporary (auxiliary) stack called auxStack to help us maintaining unchanged the content of the current stack. We accomplish the task in three parts:
1) using a “while” loop we pop the elements from the current stack and push onto the temporary step;
2) we assign to i the bottom element of the current stack (before it becomes empty) and...

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