Which of the following statements about cursors and iterators are true? (Check all that apply)

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BlackTom AI · Accepted Answer

Question asks which statements about cursors and iterators are true, with a check-all-that-apply format. 
Option 1: 'Changing the position of an iterator for an object T also changes the position of T's cursor.' This is typically false because iterators are separate abstraction layers that provide traversal control, while the cursor is an internal position within the ADT. Moving an external iterator does not inherently move the ADT's internal cursor, so this claim confuses separate concepts. 
Option 2: 'An ADT can't be coded to have more than one cursor.' This is generally false; an ADT can be designed to expose multiple internal cursors or positions, allowing several independent traversals or views to coexist. The statement imposes a universal limitation that does not hold in all designs. 
Option 3: 'Both cursors and iterators represent positions in a data structure.' This is true in standard abstractions: a cursor denotes the internal position within the structure, while an iterator provides a means to traverse positions; both are about locating or referencing positions. 
Option 4: 'A cursor is internal to an ADT (abstract data structure) but iterators are separate objects.' This is true in many formal models: the cursor is part of the ADT's internal state, whereas iterators are external objects that reference the structure to traverse it. 
Option 5: 'The user of an ADT can control how many cursors the ADT has.' This is typically false; the number of internal cursors is a design choice of the ADT, not something the user usually controls at run time. The abstraction generally hides internal cursors from direct manipulation. 
In summary, the statements that align with common ADT cursor-iterator distinctions are options 3 and 4, while options 1, 2, and 5 describe conditions that are not generally accurate in standard models.

Which of the following statements about cursors and iterators are true? (Check all that apply) 多项选择题

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