![]() In addition for this example, I added a top function to view the first item in the queue. ![]() This is easy to do as those operations are basically available in a slightly different form as list operations. This Rosetta Code Task requires that the queue operations of push (enqueue), pop (dequeue) and empty be demonstrated with App Inventor. OD Output: Get remaining values from queue: Printf ( (diet item fmt, obj queue get (example queue ), $l$ ) ) # OR example queue ISNT obj queue empty # WHILE NOT obj queue is empty (example queue ) DO Printf ($ "Get remaining values from queue:"l$ ) # obj queue put(example queue, stigler diet) or. OBJQUEUE example queue obj queue init (example queue ) PR read "prelude/queue_base.a68" PR # c.f. ) File: test/queue.a68 #!/usr/bin/a68g -script # STRING food, annual quantity, units, REAL costįORMAT diet item fmt = $g ": "g " "g " = $"zd.dd$ Queue/Definitionįile: test/data_stigler_diet.a68 # -*- coding: utf-8 -*- # Queue/Definitionįile: prelude/queue_base.a68 c.f. Works with: ALGOL 68G version Any - tested with release algol68g-2.7.įile: prelude/link.a68 c.f. You must type 'SET EndProg=*' from the monitor after compiling, but before running this program! INCLUDE "D2:ALLOCATE.ACT" from the Action! Tool Kit. Library: Action! Tool Kit CARD EndProg required for ALLOCATE.ACT The user must type in the monitor the following command after compilation and before running the program! SET EndProg=* This example shows that once an item leaves the queue, the "ghost" of the last item in line gets overwritten with the next item to join.ģ41 q:push \ push 123, 341 onto the queue Note that c0 still exists in FB, but its slot is "empty" so it will get overwritten in the 3rd example. For all examples, the subroutines above are defined below the BRK. The first test pushes three values into the queue. This example uses Easy6502 to test the various modes. PLA return the item that just left the queue LDA 0,x get the item that's first in line QueuePointerMinus1 equ #$FC make this equal whatever "queuePointerStart" is, minus 1. This software queue uses the zero page as the storage area. The queue grows down in memory as new elements join the queue. The basic principles are the same: Before the queue can be used, a "queue pointer" must first be loaded into X, which points to the first empty slot in the queue. Implementing a queue is very similar to a software stack, except the POP command is a litte more involved. 33.1 Version for the Linked List implementation.
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