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数据结构——C++版（第四版）（英文影印版）书籍详细信息
- ISBN：9787030350244
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- 出版时间：2012-09
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- 开本：16开
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内容简介：
数据结构——C++版（第四版）（英文影印版）是一本基于C++的思想、介绍数据结构和算法的大学教材，已经在全球多个国家的大学用作数据结构课程的基础教材。数据结构——C++版（第四版）（英文影印版）以C++语言作为实现语言，利用面向对象的方法，从规格说明出发，使用基础的数据类型来描述程序算法的设计与实现。书中主要内容包括：软件开发的各个阶段，抽象数据类型与C++类，容器类，指针与动态数组，链表，用模板、迭代器和STL进行软件开发，堆栈，队列，递归思想，树，平衡树，查找，排序，派生类与继承，图表。通过学习数据结构——C++版（第四版）（英文影印版），可使读者具备使用数据类型的能力，学会利用多种方法来实现数据类型，以及从不同的实现中进行取舍。
数据结构——C++版（第四版）（英文影印版）可作为计算机、电类专业本科生和非信息技术专业硕士研究生的教材，也可供工程技术人员参考。
书籍目录：
Chapter List
CHAPTER 1 THE PHASES OF SOFTWARE DEVELOPMENT
CHAPTER 2 ABSTRACT DATA TYPES AND C++ CLASSES
CHAPTER 3 CONTAINER CLASSES
CHAPTER 4 POINTERS AND DYNAMIC ARRAYS
CHAPTER 5 LINKED LISTS
CHAPTER 6 SOFTWARE DEVELOPMENT WITH TEMPLATES,ITERATORS,AND THE STL
CHAPTER 7 STACKS
CHAPTER 8 QUEUES
CHAPTER 9 RECURSIVE THINKING
CHAPTER 10 TREES
CHAPTER 11 BALANCED TREES
CHAPTER 12 SEARCHING
CHAPTER 13 SORTING
CHAPTER 14 DERIVED CLASSES AND INHERITANCE
CHAPTER 15 GRAPHS
APPENDIXES
INDEX
Contents
CHAPTER 1 THE PHASES OF SOFTWARE DEVELOPMENT
1.1 Specification,Design,Implementation
Design Concept:Decomposing the Problem
Preconditions and Postconditions
Using Functions Provided by Other Programmers
Implementation Issues for the ANSI/ISO C++ Standard
C++ Feature:The Standard Library and the Standard Namespace
Programming Tip:Use Declared Constants
Clarifying the Const Keyword Part 1:Declared Constants
Programming Tip:Use Assert to Check a Precondition
Programming Tip:Use EXIT_SUCCESS in a Main Program
C++ Feature:Exception Handling
Self-Test Exercises for Section 1.1
1.2 Running Time Analysis
The Stair-Counting Problem
Big-O Notation
Time Analysis of C++ Functions
Worst-Case,Average-Case,and Best-Case Analyses
Self-Test Exercises for Section 1.2
1.3 Testing and Debugging
Choosing Test Data
Boundary Values
Fully Exercising Code
Debugging
Programming Tip:How to Debug
Self-Test Exercises for Section 1.3
Chapter Summary
Solutions to Self-Test Exercises
CHAPTER 2 ABSTRACT DATA TYPES AND C++ CLASSES
2.1 Classes and Members
Programming Example:The Throttle Class
Clarifying the Const Keyword Part 2:Constant Member Functions
Using a Class
A Small Demonstration Program for the Throttle Class
Implementing Member Functions
Member Functions May Activate Other Members
Programming Tip:Style for Boolean Variables
Self-Test Exercises for Section 2.1
2.2 Constructors
The Throttle恠 Constructor
What Happens If You Write a Class with No Constructors?
Programming Tip:Always Provide Constructors
Revising the Throttle恠 Member Functions
Inline Member Functions
Programming Tip:When to Use an Inline Member Function
Self-Test Exercises for Section 2.2
2.3 Using a Namespace,Header File,and Implementation File
Creating a Namespace
The Header File
Describing the Value Semantics of a Class Within the Header File
Programming Tip:Document the Value Semantics
The Implementation File
Using the Items in a Namespace
Pitfall:Never Put a Using Statement Actually in a Header File
Self-Test Exercises for Section 2.3
2.4 Classes and Parameters
Programming Example:The Point Class
Default Arguments
Programming Tip:A Default Constructor Can Be Provided by Using Default Arguments
Parameters
Pitfall:Using a Wrong Argument Type for a Reference Parameter
Clarifying the Const Keyword Part 3:Const Reference Parameters
Programming Tip:Use const Consistently
When the Type of a Function恠 Return Value Is a Class
Self-Test Exercises for Section 2.4
2.5 Operator Overloading
Overloading Binary Comparison Operators
Overloading Binary Arithmetic Operators
Overloading Output and Input Operators
Friend Functions
Programming Tip:When to Use a Friend Function
The Point Class凱utting Things Together
Summary of Operator Overloading
Self-Test Exercises for Section 2.5
2.6 The Standard Template Libary and the Pair Class
Chapter Summary
Solutions to Self-Test Exercises
Programming Projects
CHAPTER 3 CONTAINER CLASSES
3.1 The Bag Class
The Bag Class凷pecification
C++ Feature:Typedef Statements Within a Class Definition
C++ Feature:The std::size_t Data Type
Clarifying the Const Keyword Part 4:Static Member Constants
Older Compilers Do Not Support Initialization of Static Member Constants
The Bag Class凞ocumentation
Documenting the Value Semantics
The Bag Class凞emonstration Program
The Bag Class凞esign
Pitfall:The value_type Must Have a Default Constructor
The Invariant of a Class
The Bag Class処mplementation
Pitfall:Needing to Use the Full Type Name bag::size_type
Programming Tip:Make Assertions Meaningful
C++ Feature:The Copy Function from the C++ Standard Library
The Bag Class凱utting the Pieces Together
Programming Tip:Document the Class Invariant in the Implementation File
The Bag Class凾esting
Pitfall:An Object Can Be an Argument to Its Own Member Function
The Bag Class凙nalysis
Self-Test Exercises for Section 3.1
3.2 Programming Project:The Sequence Class
The Sequence Class凷pecification
The Sequence Class凞ocumentation
The Sequence Class凞esign
The Sequence Class凱seudocode for the Implementation
Self-Test Exercises for Section 3.2
3.3 Interactive Test Programs
C++ Feature:Converting Input to Uppercase Letters
C++ Feature:The Switch Statement
Self-Test Exercises for Section 3.3
3.4 The STL Multiset Class and Its Iterator
The Multiset Template Class
Some Multiset Members
Iterators and the[...)Pattern
Pitfall:Do Not Access an Iterator恠 Item After Reaching end()
Testing Iterators for Equality
Other Multiset Operations
Invalid Iterators
Clarifying the Const Keyword Part 5:Const Iterators
Pitfall:Changing a Container Object Can Invalidate Its Iterators
Self-Test Exercises for Section 3.4
Chapter Summary
Solutions to Self-Test Exercises
Programming Projects
CHAPTER 4 POINTERS AND DYNAMIC ARRAYS
4.1 Pointers and Dynamic Memory
Pointer Variables
Using the Assignment Operator with Pointers
Dynamic Variables and the new Operator
Using new to Allocate Dynamic Arrays
The Heap and the bad_alloc Exception
The delete Operator
Programming Tip:Define Pointer Types
Self-Test Exercises for Section 4.1
4.2 Pointers and Arrays as Parameters
Clarifying the Const Keyword Part 6:Const Parameters That Are Pointers or Arrays
Self-Test Exercises for Section 4.2
4.3 The Bag Class with a Dynamic Array
Pointer Member Variables
Member Functions Allocate Dynamic Memory as Needed
Programming Tip:Provide Documentation about Possible Dynamic Memory Failure
Value Semantics
The Destructor
The Revised Bag Class凜lass Definition
The Revised Bag Class処mplementation
Programming Tip:How to Check for Self-Assignment
Programming Tip:How to Allocate Memory in a Member Function
The Revised Bag Class凱utting the Pieces Together
Self-Test Exercises for Section 4.3
4.4 Prescription for a Dynamic Class
Four Rules
Special Importance of the Copy Constructor
Pitfall:Using Dynamic Memory Requires a Destructor,a Copy Constructor,and an Overloaded Assignment Operator
Self-Test Exercises for Section 4.4
4.5 The STL String Class and a Project
Null-Terminated Strings
Initializing a String Variable
The Empty String
Reading and Writing String Variables
Pitfall:Using = and == with Strings
The strcpy Function
The strcat Function
Pitfall:Dangers of strcpy,strcat,and Reading Strings
The strlen Function
The strcmp Function
The String Class凷pecification
Constructor for the String Class
Overloading the Operator[]
Some Further Overloading
Other Operations for the String Class
The String Class凞esign
The String Class処mplementation
Demonstration Program for the String Class
Chaining the Output Operator
Declaring Constant Objects
Constructor-Generated Conversions
Using Overloaded Operations in Expressions
Our String Class Versus the C++ Library String Class
Self-Test Exercises for Section 4.5
4.6 Programming Project:The Polynomial
Chapter Summary
Solutions to Self-Test Exercises
Programming Projects
CHAPTER 5 LINKED LISTS
5.1 A Fundamental Node Class for Linked Lists
Declaring a Class for Nodes
Using a Typedef Statement with Linked-List Nodes
Head Pointers,Tail Pointers
The Null Pointer
The Meaning of a Null Head Pointer or Tail Pointer
The Node Constructor
The Node Member Functions
The Member Selection Operator
Clarifying the Const Keyword Part 7:The Const Keyword with a Pointer to a Node,and the Need for Two Versions of Some Member Functions
Programming Tip:A Rule for a Node恠 Constant Member Functions
Pitfall:Dereferencing the Null Pointer
Self-Test Exercises for Section 5.1
5.2 A Linked-List Toolkit
Linked-List Toolkit凥eader File
Computing the Length of a Linked List
Programming Tip:How to Traverse a Linked List
Pitfall:Forgetting to Test the Empty List
Parameters for Linked Lists
Inserting a New Node at the Head of a Linked List
Inserting a New Node That Is Not at the Head
Pitfall:Unintended Calls to delete and new
Searching for an Item in a Linked List
Finding a Node by Its Position in a Linked List
Copying a Linked List
Removing a Node at the Head of a Linked List
Removing a Node That Is Not at the Head
Clearing a Linked List
Linked-List Toolkit凱utting the Pieces Together
Using the Linked-List Toolkit
Self-Test Exercises for Section 5.2
5.3 The Bag Class with a Linked List
Our Third Bag凷pecification
Our Third Bag凜lass Definition
How to Make the Bag value_type Match the Node value_type
Following the Rules for Dynamic Memory Usage in a Class
The Third Bag Class処mplementation
Pitfall:The Assignment Operator Causes Trouble with Linked Lists
Programming Tip:How to Choose Between Approaches
The Third Bag Class凱utting the Pieces Together
Self-Test Exercises for Section 5.3
5.4 Programming Project:The Sequence Class with a Linked List
The Revised Sequence Class凞esign Suggestions
The Revised Sequence Class刅alue Semantics
Self-Test Exercises for Section 5.4
5.5 Dynamic Arrays vs. Linked Lists vs. Doubly Linked Lists
Making the Decision
Self-Test Exercises for Section 5.5
5.6 STL Vectors vs. STL Lists vs. STL Deques
Self-Test Exercises for Section 5.6
Chapter Summary
Solutions to Self-Test Exercises
Programming Projects
CHAPTER 6 SOFTWARE DEVELOPMENT WITH TEMPLATES,ITERATORS,AND THE STL
6.1 Template Functions
Syntax for a Template Function
Programming Tip:Capitalize the Name of a Template Parameter
Using a Template Function
Pitfall:Failed Unification Errors
A Template Function to Swap Two Values
Programming Tip:Swap,Max,and Min Functions
Parameter Matching for Template Functions
A Template Function to Find the Biggest Item in an Array
Pitfall:Mismatches for Template Function Arguments
A Template Function to Insert an Item into a Sorted Array
Self-Test Exercises for Section 6.1
6.2 Template Classes
Syntax for a Template Class
Programming Tip:Use the Name Item and the typename Keyword
Pitfall:Do Not Place Using Directives in a Template Implementation
More About the Template Implementation File
Parameter Matching for Member Functions of Template Classes
Using the Template Class
Details of the Story-Writing Program
Self-Test Exercises for Section 6.2
6.3 The STL恠 Algorithms and Use of Iterators
STL Algorithms
Standard Categories of Iterators
Iterators for Arrays
Self-Test Exercises for Section 6.3
6.4 The Node Template Class
Functions That Return a Reference Type
What Happens When a Reference Return Value Is Copied Elsewhere
The Data Member Function Now Requires Two Versions
Header and Implementation Files for the New Node
Self-Test Exercises for Section 6.4
6.5 An Iterator for Linked Lists
The Node Iterator
The Node Iterator Is Derived from std::iterator
Pitfall:std::iterator Might Not Exist
The Node Iterator恠 Private Member Variable
Node Iterator凜onstructor
Node Iterator則he*Operator
Node Iterator凾wo Versions of the ++ Operator
Programming Tip:++p Is More Efficient Than p++
Iterators for Constant Collections
Programming Tip:When to Use a Const Iterator
Self-Test Exercises for Section 6.5
6.6 Linked-List Version of the Bag Template Class with an Iterator
How to Provide an Iterator for a Container Class That You Write
The Bag Iterator
Why the Iterator Is Defined Inside the Bag
Self-Test Exercises for Section 6.6
Chapter Summary and Summary of the Five Bags
Solutions to Self-Test Exercises
Programming Projects
CHAPTER 7 STACKS
7.1 The STL Stack Class
The Standard Library Stack Class
Programming Example:Reversing a Word
Self-Test Exercises for Section 7.1
7.2 Stack Applications
Programming Example:Balanced Parentheses
Programming Example:Evaluating Arithmetic Expressions
Evaluating Arithmetic Expressions凷pecification
Evaluating Arithmetic Expressions凞esign
Evaluating Arithmetic Expressions処mplementation
Functions Used in the Calculator Program
Evaluating Arithmetic Expressions凾esting and Analysis
Evaluating Arithmetic Expressions凟nhancements
Self-Test Exercises for Section 7.2
7.3 Implementations of the Stack Class
Array Implementation of a Stack
Linked-List Implementation of a Stack
The Koenig Lookup
Self-Test Exercises for Section 7.3
7.4 More Complex Stack Applications
Evaluating Postfix Expressions
Translating Infix to Postfix Notation
Using Precedence Rules in the Infix Expression
Correctness of the Conversion from Infix to Postfix
Self-Test Exercises for Section 7.4
Chapter Summary
Solutions to Self-Test Exercises
Programming Projects
CHAPTER 8 QUEUES
8.1 The STL Queue
The Standard Library Queue Class
Uses for Queues
Self-Test Exercises for Section 8.1
8.2 Queue Applications
Programming Example:Recognizing Palindromes
Self-Test Exercises for Middle of Section 8.2
Programming Example:Car Wash Simulation
Car Wash Simulation凷pecification
Car Wash Simulation凞esign
Car Wash Simulation処mplementing the Car Wash Classes
Car Wash Simulation処mplementing the Simulation Function
Self-Test Exercises for End of Section 8.2
8.3 Implementations of the Queue Class
Array Implementation of a Queue
Programming Tip:Use Small Helper Functions to Improve Clarity
Discussion of the Circular Array Implementation of a Queue
Linked-List Implementation of a Queue
Implementation Details
Programming Tip:Make Note of 岲on恡 Care
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书籍摘录：
The Phases of
1
Software Development
chapter
Chapter the first which explains how, why, when, and where there was ever any problem in the first place
NOEL LANGLEY
The Land of Green Ginger
LEARNING OBJECTIVES
When you complete Chapter 1, you will be able to...
write precondition/postcondition contracts for small functions, and use the C++ assert facility to test preconditions.
recognize quadratic, linear, and logariindicesthmic running time behavior in simple algorithms, and write bigO expressions to describe this behavior.
create and recognize test data that is appropriate for simple problems, including testing boundary conditions and fully exercising code.
CHAPTER CONTENTS
1.1 Specification, Design, Implementation
1.2 Running Time Analysis
1.3 Testing and Debugging Chapter Summary Solutions to SelfTest Exercises
Chapter 1 / The Phases of Software Development
the phases blur into each other
This chapter illustrates the phases of software development.These phases occur in all software, including the small programs that you’ll seein this first chapter. In subsequent chapters, you’ll go beyond these small pro-grams, applying the phases of software development to organized collections ofdata. These organized collections of data are called data structures, and the main topics of this book revolve around proven techniques for representing andmanipulating such data structures.
Years from now you may be a software engineer writing large systems in aspecialized area, perhaps computer graphics or artificial intelligence. Suchfuturistic applications will be exciting and stimulating, and within your workyou will still see the phases of software development and fundamental datastructures that you learn and practice now.
Here is a list of the phases of software development::
The Phases of Software Development
Specification of the task
Design of a solution
Implementation (coding) of the solution
Analysis of the solution
Testing and debugging
Maintenance and evolution of the system
Obsolescence
Do not memorize this list: Throughout the book, your practice of these phaseswill achieve far better familiarity than mere memorization. Also, memorizing an“official list” is misleading because it suggests that there is a single sequence ofdiscrete steps that always occur one after another. In practice, the phases blurinto each other; for instance, the analysis of a solution’s efficiency may occurhand in hand with the design, before any coding. Or low-level design decisionsmay be postponed until the implementation phase. Also, the phases might notoccur one after another. Typically there is back-and-forth travel between thephases.
Most of the work in software development does not depend on any particularprogramming language. Specification, design, and analysis can all be carried outwith few or no ties to a particular programming language. Nevertheless, when weget down to implementation details, we do need to decide on one particular pro-gramming language. The language we use in this book is C++.
Specification, Design, Implementation 33
What You Should Know About C++ Before Starting This Text
The C++ language was designed by Bjarne Stroustrup at AT&T Bell Lab-oratories as an extension of the C language, with the purpose of supporting object-oriented programming (OOP)—a technique that encourages important strategies of information hiding and component reuse. Throughout this book, we introduce you to important OOP principles to use in your designs and imple-mentations.
There are many different C++ compilers that you may successfully use with this text. Ideally, the compiler should support the latest features of the ANSI/ISO C++ Standard, which we have incorporated into the text. However, there are sev-eral workarounds that can be applied to older compilers that don’t fully support the standard. (See Appendix K, “Downloading the GNU Compiler Software,” and Appendix E, “Dealing with Older Compilers.”)
Whichever programming environment you use, you should already be com-fortable writing, compiling, and running short C++ programs built with a top-down design. You should know how to use the built-in types (the number types, char, and bool), and you should be able to use arrays.
Throughout the text, we will introduce the important roles of the C++ Stan-dard Library, though you do not need any previous knowledge of the library. Studying the data structures of the Standard Library can help you understand trade-offs between different approaches, and can guide the design and imple-mentation of your own data structures. When you are designing your own data structures, an approach that is compliant with the Standard Library has twofold benefits: Other programmers will understand your work more easily, and your own work will readily benefit from other pieces of the Standard Library, such as the standard searching and sorting algorithms.
The rest of this chapter will prepare you to tackle the topic of data structures in C++, using an approach that is compliant with the Standard Library. Section
1.1 focuses on a technique for specifying program behavior, and you’ll also see some hints about design and implementation. Section 1.2 illustrates a particular kind of analysis: the running time analysis of a program. Section 1.3 provides some techniques for testing and debugging programs.
1.1 SPECIFICATION, DESIGN, IMPLEMENTATION
One begins with a list of difficult design decisions which
are likely to change. Each module is then designed to hide
such a decision from the others.
D. L. PARNAS
“On the Criteria to Be Used in Decomposing Systems into Modules”
OOP supports information hiding and component reuse
you should already know how to write, compile, and run short C++ programs
C++
Standard
Library
CONVERSIONS FROM -50.0 to 50.0
Celsius -50.0C -40.0C -30.0C -20.0C -10.0C 0.0C 10.0C 20.0C 30.0C 40.0C 50.0C
Break down a task into a few subtasks; then decompose each subtask into smaller subtasks.
Fahrenheit
The actual Fahrenheit temperatures will be computed and displayed on this side of the table.
As an example of software development in action, let’s examine the specification, design, and implementation for a particular problem. The specification is a precise description of the problem; the design phase consists of formulating the steps to solve the problem; the imple-mentation is the actual C++ code that carries out the design.
The problem we have in mind is to display a table for converting Celsius temperatures to Fahrenheit, similar to the table shown in the margin. For a small problem, a sample of the desired output is a sufficient specification. Such a sample is a good specification because it is precise, leaving no doubt about what the program must accomplish. The next step is to design a solution.
An algorithm is a set of instructions for solving a problem. An algorithm for the temperature problem will print the conversion table. During the design of the algorithm, the details of a particular programming language can be distracting, and can obscure the simplicity of a solution. Therefore, during the design we generally write in English. We use a rather corrupted kind of English that mixes in C++ when it’s convenient. This mixture of English and a programming language is called pseudocode. When the C++ code for a step is obvious, then the pseudocode may use C++. When a step is clearer in English, then we will use English. Keep in mind that the reason for pseudocode is to improve clarity.
We’ll use pseudocode to design a solution for the temperature problem, and we’ll also use the important design technique of decomposing the problem.
Design Concept: Decomposing the Problem
A good technique for designing an algorithm is to break down the problem at hand into a few subtasks, then decompose each subtask into smaller subtasks, then replace the smaller subtasks with even smaller subtasks, and so forth. Eventually the subtasks become so small that they are trivial to implement in C++ or what-ever language you are using. When the algorithm is translated into C++, each subtask is implemented as a separate C++ function. In other programming lan-guages, functions are called “methods” or “procedures,” but it all boils down to the same thing: The large problem is decomposed into subtasks, and subtasks are implemented as separate pieces of your program.
For example, the temperature problem has at least two good subtasks:
(1) converting a temperature from Celsius degrees to Fahrenheit, and (2) printing a line of the conversion table in the specified format. Using these subproblems, the first draft of our pseudocode might look like this:
Specification, Design, Implementation 35
1.
Do preliminary work to open and set up the output device properly.
2.
Display the labels at the top of the table.
3.
For each line in the table (using variables celsius and fahrenheit):
a.
Set celsius equal to the next Celsius temperature of the table.
b.
fahrenheit = the celsius temperature converted to Fahrenheit.
c.
Print the Celsius and Fahrenheit values with labels on an output line.
We have identified the major subtasks. But aren’t there other ways to decom-what makes a pose the problem into subtasks? What are the aspects of a good decomposition? goodOne primary guideline is that the subtasks should help you produce short decomposition? pseudocode—no more than a page of succinct description to solve the entire problem, and ideally much less than a page. In your designs, you can also keep in mind two considerations for selecting good subtasks: the potential for code reuse, and the possibility of future changes to the program. Let’s see how our subtasks embody these considerations.
Step 1 opens an output device, making it ready for output in a particular form. code reuse This is a common operation that many programs must carry out. If we write a function for Step 1 with sufficient flexibility, we can probably reuse the function in other programs. This is an example of code reuse, in which a function is writ-ten with sufficient generality that it can be reused elsewhere. In fact, program-mers often produce collections of related C++ functions that are made available in packages to be reused over and over with many different application programs. Later we will use the C++ Standard Library as this sort of package, and we will also write our own packages of this kind. For now, just keep in mind that the function for Step 1 should be written with some reuse in mind.
Decomposing problems also produces a good final program in the sense that easily modified the program is easy to understand, and subsequent maintenance and modifica-code tions are relatively easy. Our temperature program might be modified to convert to Kelvin degrees instead of Fahrenheit, or even to do a completely different con-version such as feet to meters. If the conversion task is performed by a separate function, much of the modification will be confined to this one function. Easily modified code is vital since real-world studies show that a large proportion of programmers’ time is spent maintaining and modifying existing programs.
In order for a problem decomposition to produce easily modified code, thefunctions that you write need to be genuinely separated from one another. Ananalogy can help explain the notion of “genuinely separated.” Suppose you aremoving a bag of gold coins to a safe hiding place. If the bag is too heavy to carry,you might divide the coins into three smaller bags and carry the bags one by one.Unless you are a character in a comedy, you would not try to carry all three bagsat once. That would defeat the purpose of dividing the coins into three groups.This strategy works only if you carry the bags one at a time. Something similarhappens in problem decomposition. If you divide your programming task intothree subtasks and solve these subtasks by writing three functions, then you have
procedural abstraction
traded one hard problem for three easier problems. Your total job has becomeeasier—provided that you design the functions separately. When you are work-ing on one function, you should not worry about how the other functions performtheir jobs. But the functions do interact. So when you are designing one function,you need to know something about what the other functions do. The trick is toknow only as much as you need, but no more. This is called information hiding. One technique for incorporating information hiding involves specifying yourfunctions’ behavior using preconditions and postconditions.
Preconditions and Postconditions
When you write a complete function definition, you specify how the functionperforms its computation. However, when you are using a function, you onlyneed to think about what the function does. You need not think about how the function does its work. For example, suppose you are writing the temperatureconversion program and you are told that a function is available for you to use,as described here:
// Convert a Celsius temperature c to Fahrenheit degreesdouble celsius_to_fahrenheit(double c);
Your program might have a double variable called celsius that contains a Cel-sius temperature. Knowing this description, you can confidently write the fol-lowing statement to convert the temperature to Fahrenheit degrees, storing theresult in a double variable called fahrenheit:
fahrenheit = celsius_to_fahrenheit(celsius);
When you use the celsius_to_fahrenheit function, you do not need to knowthe details of how the function carries out its work. You need to know what the function does, but you do not need to know how the task is accomplished.
When we pretend that we do not know how a function is implemented, we areusing a form of information hiding called procedural abstraction. This tech-nique simplifies your reasoning by abstracting away irrelevant details—that is,by hiding the irrelevant details. When programming in C++, it might make moresense to call it “functional abstraction,” since you are abstracting away irrelevantdetails about how a function works. However, the term procedure is a more gen-eral term than function. Computer scientists use the term procedure for anysequence of instructions, and so they use the term procedural abstraction. Pro-cedural abstraction can be a powerful tool. It simplifies your reasoning by allow-ing you to consider functions one at a time rather than all together.
To make procedural abstraction work for us, we need some techniques for documenting what a function does without indicating how the function works. We could just write a short comment as we did for celsius_to_fahrenheit. However, the short comment is a bit incomplete—for instance, the comment doesn’t indicate what happens if the parameter c is smaller than the lowest Celsius temperature (.273.15°C,which is absolute zero for Celsius temperatures).
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知识深度：3分
知识广度：7分
实用性：6分
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现实相关：8分
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网站评分
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书籍清晰度：9分
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