stacks and queues - pepperdine universitystacks and queues chapter 7. design patterns for data...

Design Patterns for Data Structures

Stacks and Queues

Chapter 7


Demo StackA

Chapter 7


An array implementation of a stack

• A safe array of data elements: _data

• An integer pointer to the top of the stack: _top

StackA

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8.1 Array Implementations 245

_data[1][0] [3][2] [5][4]

(a)!Initial state. (b)!push(3.3);_top

_data[1][0] [3][2] [5][4]

3.3

_top(c)!push(5.5);

_data[1][0] [3][2] [5][4]

3.3

_top

5.5

(d)!push(4.4);

_data 3.3

_top

5.5 4.4

(d)!pop(); Returns 4.4.

_data 3.3

_top

5.5 4.4

(e)!push(1.1);

_data 3.3

_top

5.5 1.1

Figure 8.2 Action of push() and pop() with the StackA data structure.

“Huardest gefburn”? Kjift – not at all! A blind text like this gives you informationabout the selected font, how the letters are written and an impression of the look. Thistext should contain all letters of the alphabet and it should be written in of the originallanguage. There is no need for special content, but the length of words should match thelanguage.

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Hello, here is some text without a meaning. This text should show what a printedtext will look like at this place. If you read this text, you will get no information. Really?Is there no information? Is there a difference between this text and some nonsense like“Huardest gefburn”? Kjift – not at all! A blind text like this gives you informationabout the selected font, how the letters are written and an impression of the look. Thistext should contain all letters of the alphabet and it should be written in of the originallanguage. There is no need for special content, but the length of words should match thelanguage.

Revised: June 29, 2016 Copyright ©: 1998, Dung X. Nguyen and J. Stanley Warford

Figure 7.2


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Demo QueueA

Chapter 7


An array implementation of a queue

• A safe array of data elements: _data

• An integer pointer to the head of the queue: _head

• An integer pointer to the tail of the queue: _tail

• The queue is circular

QueueA

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8.1 Array Implementations 249

_data[1][0] [3][2] [5][4]

(a)!Initial state. (b)!enqueue(3.3);

_head

_data[1][0] [3][2] [5][4]

3.3

_tail

(c)!enqueue(5.5);

_data[1][0] [3][2] [5][4]

3.3 5.5

_tail_head _tail_head

(d)!enqueue(4.4);

_data 3.3 5.5

_tail_head

4.4

(e)!dequeue(); Returns 3.3.

_data 5.5

_tail_head

4.4

(f)!enqueue(9.9);

_data 5.5

_tail_head

4.4 9.9

(g)!enqueue(1.1);

_data 5.5

_tail_head

4.4 9.9 1.1

(h)!dequeue(); Returns 5.5.

_data 1.1

_tail_head

4.4 9.9

(i)!dequeue(); Returns 4.4.

_data

_tail_head

9.9 1.1

(j)!enqueue(7.7);

_data 1.1

_tail _head

7.79.9 _data 1.1

_tail _head

7.79.9

(k)!enqueue(6.6);

6.6 _data 1.1

_tail _head

7.79.9

(l)!enqueue(2.2); The queue is full.

6.6 2.2

Figure 8.6 Action of enqueue() and dequeue() with the QueueA data structure.

“Huardest gefburn”? Kjift – not at all! A blind text like this gives you informationabout the selected font, how the letters are written and an impression of the look. Thistext should contain all letters of the alphabet and it should be written in of the originallanguage. There is no need for special content, but the length of words should match thelanguage.

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Figure 7.6

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The Adapter Design PatternAlso known as the Wrapper Pattern

Chapter 7

Adapter allows classes with incompatible interfaces to work together by wrapping its own interface around that of an already existing class.

https://en.wikipedia.org/wiki/Adapter_pattern

https://en.wikipedia.org/wiki/Adapter_pattern


A linked list implementation of the stack

Chapter 7

The stack wraps its own interface around that of the already existing linked list.


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Design Patterns for Data Structures Figure 7.9252 Chapter 8 Stacks and Queues

ListL

– ListL(rhs: ListL<T> const &)+ ListL( )+ ~ListL( )+ append(data: T const &)+ clear( )+ concat(suffix: ListL<T> &)+ contains(data: T const &) const: bool– copyHead(rhs: ListL<T> const &): LNode<T> *+ equals(rhs: ListL<T> const &) const: bool+ first( ) const: T const &+ isEmpty( ) const: bool + length( ) const: int+ max( ) const: T const &+ operator=(rhs: ListL<T> const &): ListL<T> &+ prepend(data: T const &)+ remFirst( ): T+ remLast( ): T+ remove(data: T const &)+ reverse( )+ setFirst(data: T const &)+ toStream(os: ostream &) const+ unZip( ): ListL<T> *+ zip(other: ListL<T> &)

T

– _head: LNode<T> * LNode– _data: T– _next: LNode *– LNode(data: T)

T

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+ StackL( )+ ~StackL( )+ isEmpty( ) const: bool + push(val: T const &)+ pop( ): T+ topOf( ) const: T const &+ toStream(os: ostream &) const

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Figure 8.9 The adapter design pattern for the StackL data structure.

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The list implementation of a stack

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A linked list implementation of the queue

Chapter 7

The queue wraps its own interface around that of the already existing linked list.

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The Priority Queue

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55

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55

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40

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Figure 8.13 Action of siftUp() with the PriorityQ data structure.

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Figure 7.13


8.3 The Priority Queue 259

55

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Figure 8.13 Action of siftUp() with the PriorityQ data structure.

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Figure 7.13


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40 60 20

90

(a)!insert(80);

40

30

75

65

10 25

50

55

45

40 60 20

90


40

30

75

65

10 25

50

55

45

40 60 20

90


40

30

65

10 25

80

80

75

50




Figure 7.17

stacks and queues - pepperdine universitystacks and queues chapter 7. design patterns for data...

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