terminology about the queues

Data members (Fields ) OF QUEUES

size	Represents the number of storage locations available in a queue for storing the data.
f	Represents substripts of a queue from which elements are deleted. F stands for front-end
r	Represents subscripts of a queue from which elements are inserted. R stands for Rear end
a The above are user defined data members. Instead you can write any identifier.  What is enqueue and dequeue ? Queues:	Pointer “a” points to run time queue