In text editors, the undo feature can be implemented using a stack. What could each entry in the stack be typically?Group of answer choicesThe position of the cursor.A command or an action performed.A pointer to the previous document state.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 choicesThe position of the cursor.A command or an action performed.A pointer to the previous document state.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 in a stack (which follows a Last-In-First-Out structure), the most recent action can be easily accessed and reversed. This wouldn't be as efficient if the stack stored the position of the cursor, a pointer to the previous document state, or a copy of the entire document.
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