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6.1.1 The Stack Abstract Data Type Stacks are the simplest of all data structures, yet they are also among the most important, as they are used in a host of different applications, and as a tool for many more sophisticated data structures and algorithms. Formally, a stack is an abstract data type (ADT) that supports the following two update methods: push(e): Adds element e to the top of the stack. pop(): Removes and returns the top element from the stack (or null if the stack is empty). Additionally, a stack supports the following accessor methods for convenience: top(): Returns the top element of the stack, without removing it (or null if the stack is empty). size(): Returns the number of elements in the stack. isEmpty(): Returns a boolean indicating whether the stack is empty. By convention, we assume that elements added to the stack can have arbitrary type and that a newly created stack is empty. Example 6.3: The following table shows a series of stack operations and their effects on an initially empty stack S of integers. Method push(5) push(3) size() pop() isEmpty() pop() isEmpty() pop() push(7) push(9) top() push(4) size() pop() push(6) push(8) pop() Return Value Stack Contents (5) (5,3) W NI 2 3 false 5 true null 9 1341 | 00 8 (5,3) (5) (7,9) (7,9) (7,9, 4) (7, 9, 4) (7,9) (7,9,6) (7, 9, 6, 8) (7,9,6)

6.1.1 The Stack Abstract Data Type Stacks are the simplest of all data structures, yet they are also among the most important, as they are used in a host of different applications, and as a tool for many more sophisticated data structures and algorithms. Formally, a stack is an abstract data type (ADT) that supports the following two update methods: push(e): Adds element e to the top of the stack. pop(): Removes and returns the top element from the stack (or null if the stack is empty). Additionally, a stack supports the following accessor methods for convenience: top(): Returns the top element of the stack, without removing it (or null if the stack is empty). size(): Returns the number of elements in the stack. isEmpty(): Returns a boolean indicating whether the stack is empty. By convention, we assume that elements added to the stack can have arbitrary type and that a newly created stack is empty. Example 6.3: The following table shows a series of stack operations and their effects on an initially empty stack S of integers. Method push(5) push(3) size() pop() isEmpty() pop() isEmpty() pop() push(7) push(9) top() push(4) size() pop() push(6) push(8) pop() Return Value Stack Contents (5) (5,3) W NI 2 3 false 5 true null 9 1341 | 00 8 (5,3) (5) (7,9) (7,9) (7,9, 4) (7, 9, 4) (7,9) (7,9,6) (7, 9, 6, 8) (7,9,6)

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Java programming homework

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1 Chapter 6 Stacks, Queues, and Deques On Page 227, Section 6.1.1, use array or linked list to implement the Stack Abstract Data Type. That means implementing all the 5 functions and run your codes on Example 6.3. Your program should print out that table in Example 6.3.
Transcribed Image Text:1 Chapter 6 Stacks, Queues, and Deques On Page 227, Section 6.1.1, use array or linked list to implement the Stack Abstract Data Type. That means implementing all the 5 functions and run your codes on Example 6.3. Your program should print out that table in Example 6.3.
6.1.1 The Stack Abstract Data Type Stacks are the simplest of all data structures, yet they are also among the most important, as they are used in a host of different applications, and as a tool for many more sophisticated data structures and algorithms. Formally, a stack is an abstract data type (ADT) that supports the following two update methods: push(e): Adds element e to the top of the stack. pop(): Removes and returns the top element from the stack (or null if the stack is empty). Additionally, a stack supports the following accessor methods for convenience: top(): Returns the top element of the stack, without removing it (or null if the stack is empty). size(): Returns the number of elements in the stack. isEmpty(): Returns a boolean indicating whether the stack is empty. By convention, we assume that elements added to the stack can have arbitrary type and that a newly created stack is empty. Example 6.3: The following table shows a series of stack operations and their effects on an initially empty stack S of integers. Method push(5) push (3) size() pop() isEmpty() pop() isEmpty() pop() push (7) push(9) top() push(4) size() pop() push(6) push(8) pop() Return Value Stack Contents (5) (5, 3) (5,3) (5) 2 WN 3 false 5 true null |||3|| 00 4 8 (7) (7,9) (7,9) (7, 9, 4) (7, 9, 4) (7,9) (7, 9, 6) (7, 9, 6, 8) (7, 9, 6)
Transcribed Image Text:6.1.1 The Stack Abstract Data Type Stacks are the simplest of all data structures, yet they are also among the most important, as they are used in a host of different applications, and as a tool for many more sophisticated data structures and algorithms. Formally, a stack is an abstract data type (ADT) that supports the following two update methods: push(e): Adds element e to the top of the stack. pop(): Removes and returns the top element from the stack (or null if the stack is empty). Additionally, a stack supports the following accessor methods for convenience: top(): Returns the top element of the stack, without removing it (or null if the stack is empty). size(): Returns the number of elements in the stack. isEmpty(): Returns a boolean indicating whether the stack is empty. By convention, we assume that elements added to the stack can have arbitrary type and that a newly created stack is empty. Example 6.3: The following table shows a series of stack operations and their effects on an initially empty stack S of integers. Method push(5) push (3) size() pop() isEmpty() pop() isEmpty() pop() push (7) push(9) top() push(4) size() pop() push(6) push(8) pop() Return Value Stack Contents (5) (5, 3) (5,3) (5) 2 WN 3 false 5 true null |||3|| 00 4 8 (7) (7,9) (7,9) (7, 9, 4) (7, 9, 4) (7,9) (7, 9, 6) (7, 9, 6, 8) (7, 9, 6)
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