
Introduction to Java Programming and Data Structures: Brief Version (11th Global Edition)
11th Edition
ISBN: 9780134671710
Author: Y. Daniel Liang
Publisher: PEARSON
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Chapter 27.7, Problem 27.7.4CP
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Part B - Implement the Queue in LC-3
Now implement a similar circular queue in LC-3 assembly.
Data structure in memory
Use the following layout (similar style to the stack code from class):
Q_BASE
.FILL X4100; base address of queue array
; capacity (in elements)
Q_CAPACITY.BLKW #1
Q_HEAD .BLKW #1
QTAIL .BLKW #1
Q_SIZE .BLKW #1
; index of front element (0..capacity-1)
; index one past last element (0..capacity-1)
; current number of elements (0..capacity)
We will use this calling convention:
ENQUEUE
Input: RO = value to enqueue
Output:
R5 = 1 if success
R5 = 0 if failure (queue full; queue unchanged)
DEQUEUE
Input: none
Output:
If queue not empty:
RO dequeued value
R5 = 1 (success)
If queue empty:
R5 = 0 (failure; queue unchanged; RO don't care)
B1. Subroutine Queuelnit
Write an LC-3 subroutine Queuelnit with this behavior:
Input: RO capacity (number of elements, e.g., 5)
Effects:
Stores capacity into Q CAPACITY
Sets Q HEAD = 0
Sets Q TAIL = 0
Sets Q SIZE = 0
RO should be restored to…
A2. Trace the queue operations
Draft the Queue by hand. Assume we start with an empty queue.
head = 0, tail = 0, size = 0
data = [?, ?, ?, ?, ?] (contents unknown at first)
Trace the following sequence step by step:
enqueue(10)
enqueue(20)
enqueue(30)
dequeue()
enqueue(40)
Part C - Manual LC-3 Trace (Registers + Memory)
In this part, you will simulate your LC-3 queue by hand.
Assume the following initial conditions in memory:
Q_BASE
= x4100
(Q_BASE..Q_BASE+4) are initially unknown (don't care)
Q CAPACITY
= 5
Q_HEAD
= 0
QTAIL
= 0
Q_SIZE = 0
And assume your main program executes this sequence of calls:
RO <- #5
JSR QueueInit
RO <- #7
JSR ENQUEUE
RO <-
#3
JSR ENQUEUE
RO <- #9
JSR ENQUEUE
JSR DEQUEUE
RO <-
#5
JSR ENQUEUE
JSR DEQUEUE
JSR DEQUEUE
JSR DEQUEUE ; one extra dequeue
Chapter 27 Solutions
Introduction to Java Programming and Data Structures: Brief Version (11th Global Edition)
Chapter 27.2, Problem 27.2.1CPChapter 27.3, Problem 27.3.1CPChapter 27.3, Problem 27.3.2CPChapter 27.3, Problem 27.3.3CPChapter 27.3, Problem 27.3.4CPChapter 27.3, Problem 27.3.5CPChapter 27.3, Problem 27.3.6CPChapter 27.3, Problem 27.3.7CPChapter 27.3, Problem 27.3.8CPChapter 27.3, Problem 27.3.9CP
Chapter 27.4, Problem 27.4.1CPChapter 27.4, Problem 27.4.2CPChapter 27.4, Problem 27.4.3CPChapter 27.4, Problem 27.4.4CPChapter 27.4, Problem 27.4.5CPChapter 27.4, Problem 27.4.6CPChapter 27.5, Problem 27.5.1CPChapter 27.6, Problem 27.6.1CPChapter 27.6, Problem 27.6.2CPChapter 27.6, Problem 27.6.3CPChapter 27.7, Problem 27.7.1CPChapter 27.7, Problem 27.7.2CPChapter 27.7, Problem 27.7.3CPChapter 27.7, Problem 27.7.4CPChapter 27.7, Problem 27.7.5CPChapter 27.7, Problem 27.7.6CPChapter 27.7, Problem 27.7.7CPChapter 27.8, Problem 27.8.1CPChapter 27.8, Problem 27.8.2CPChapter 27.8, Problem 27.8.3CPChapter 27.8, Problem 27.8.4CPChapter 27, Problem 27.1PEChapter 27, Problem 27.2PEChapter 27, Problem 27.4PEChapter 27, Problem 27.6PEChapter 27, Problem 27.7PEChapter 27, Problem 27.8PEChapter 27, Problem 27.10PEChapter 27, Problem 27.11PEChapter 27, Problem 27.12PEChapter 27, Problem 27.13PEChapter 27, Problem 27.14PE
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