When tracing the execution of an object by hand, what is one way to indicate the change of an instance variable when a mutator method is executed?
A)Add a new index card for each change.
B)Cross out the old value and write down the new value.
C)Turn the card over and check the "mutator" box.
D)Put a check mark in the upper left corner of the index card.

Question

Quizplus · Accepted Answer

Crossing out the old value and writing down the new value is a clear and efficient way to indicate the change of an instance variable when a mutator method is executed. This method effectively shows that the old value is no longer valid and has been replaced by the new value. Adding new index cards or flipping them over may become confusing or cluttered, and putting a check mark does not clearly indicate the change in value.

When Tracing the Execution of an Object by Hand, What