Which class represents a First-In-First-Out (FIFO) collection, which is useful for storing objects in the order they were received for sequential processing?

Which operator can you use with objects of a class without using operator overloading?

What will be an ideal response?

Rewrite looper from the previous step, calling it looper2. Have this version of the program use the for...in control structure (Sobell, page 447) to per- form the same task.

What will be an ideal response?