What are the operators of each of the four abstract data types?

Answers:

The operators of the ADT "stack" are:

   initialize
   empty (a Boolean function)
   push
   pop

The operators of the ADT "queue" are:

   initialize
   empty (a Boolean function)
   enqueue
   dequeue

The operators of the ADT "search structure" are:

   initialize
   insert
   find
   delete

The operators of the ADT "array" are:

   store
   fetch