In text editors, the undo feature can be implemented using a stack. What could each entry in the stack be typically?Group of answer choicesA pointer to the previous document state.A command or an action performed.The position of the cursor.A copy of the entire document.
Question
In text editors, the undo feature can be implemented using a stack. What could each entry in the stack be typically?Group of answer choicesA pointer to the previous document state.A command or an action performed.The position of the cursor.A copy of the entire document.
Solution
Each entry in the stack could typically be a command or an action performed. This is because the undo feature works by reversing the most recent actions. By storing each action as an entry in the stack, the text editor can "pop" the most recent action off the stack and reverse it when the user chooses to undo. This is more efficient and practical than storing a pointer to the previous document state or a copy of the entire document, as those would require significantly more memory. The position of the cursor is not typically stored in the undo stack because it does not represent an action performed on the document.
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