Home > Store

Sams Teach Yourself C in 21 Days, 6th Edition

Sams Teach Yourself C in 21 Days, 6th Edition

Premium Website

  • Sorry, this book is no longer in print.
Not for Sale

Also available in other formats.

Register your product to gain access to bonus material or receive a coupon.


  • Copyright 2003
  • Edition: 6th
  • Premium Website
  • ISBN-10: 0-672-32448-2
  • ISBN-13: 978-0-672-32448-2

In just 21 days, you'll have all the skills you need to get started with C. With this complete tutorial, you'll master the basics and them move on to the more advanced features and concepts.

  • Understand the fundamentals of C.
  • Master all the new and advanced features that C offers.
  • Learn how to effectively use the latest tools and features of C, by following practical, real-world examples.
  • Includes a CD with all code examples and an ANSI-compliant C compiler.

IMPORTANT NOTE: Windows XP or 32-bit Windows 7 recommended — will not run on 64-bit Windows systems!



Download free code files associated with Sams Teach Yourself C in 21 Days here

Sample Content

Online Sample Chapters

Storing Information: Variables and Constants

Storing Information: Variables and Constants in C

Table of Contents



Where You're Going.

Day 1. Getting Started with C.

A Brief History of the C Language. Why Use C? Preparing to Program. The Program Development Cycle. Your First C Program.

Type & Run 1. Printing Your Listings.

The First Type & Run.

Day 2. The Components of a C Program.

A Short C Program. The Program's Components. A Review of the Parts of a Program.

Day 3. Storing Information: Variables and Constants.

Understanding Your Computer's Memory. Storing Information with Variables. Numeric Variable Types. Constants.

Day 4. The Pieces of a C Program: Statements, Expressions, and Operators.

Statements. Understanding Expressions. Operators. The if Statement. Evaluating Relational Expressions. The Logical Operators. More on True/False Values. Operator Precedence Revisited.

Type & Run 2. Find the Number.
Day 5. Packaging Code in Functions.

What Is a Function? How a Function Works. Functions and Structured Programming. Writing a Function. Passing Arguments to a Function. Calling Functions. Where the Functions Belong. Working with Inline Functions.

Day 6. Basic Program Control.

Arrays: The Basics. Controlling Program Execution. Nested Loops.

Day 7. Fundamentals of Reading and Writing Information.

Displaying Information On-Screen. Inputting Numeric Data with scanf(). Using Trigraph Sequences.

Week 1 In Review.


Where You're Going.

Day 8. Using Numeric Arrays.

What Is an Array? Naming and Declaring Arrays.

Day 9. Understanding Pointers.

What Is a Pointer? Pointers and Simple Variables. Pointers and Variable Types. Pointers and Arrays. Pointer Cautions. Array Subscript Notation and Pointers. Passing Arrays to Functions.

Type & Run 3. Pausing for a Second or Two.
Day 10. Working with Characters and Strings.

The char Data Type. Using Character Variables. Using Strings. Strings and Pointers. Strings Without Arrays. Displaying Strings and Characters. Reading Strings from the Keyboard.

Day 11. Implementing Structures, Unions, and TypeDefs.

Working with Simple Structures. Using Structures That are More Complex. Arrays of Structures. Initializing Structures. Structures and Pointers. Understanding Unions. Creating Synonyms for Structures with typedef.

Day 12. Understanding Variable Scope.

What Is Scope? Creating External Variables. Creating Local Variables. Local Variables and the main() Function. Which Storage Class Should You Use? Local Variables and Blocks.

Type & Run 4. Secret Messages.
Day 13. Advanced Program Control.

Ending Loops Early. The goto Statement. Infinite Loops. The switch Statement. Exiting the Program. Executing Operating System Commands in a Program.

Day 14. Working with the Screen, Printer, and Keyboard.

Streams and C. Using C's Stream Functions. Accepting Keyboard Input. Controlling Output to the Screen. Redirecting Input and Output. When to Use fprintf().

Week 2 In Review.


Where You're Going.

Day 15. Pointers: Beyond the Basics.

Declaring Pointers to Pointers. Pointers and Multidimensional Arrays. Working with Arrays of Pointers. Working with Pointers to Functions. Bonus Section: Understanding Linked Lists.

Day 16. Using Disk Files.

Relating Streams to Disk Files. Understanding the Types of Disk Files. Using Filenames. Opening a File. Writing and Reading File Data. File Buffering: Closing and Flushing Files. Understanding Sequential Versus Random File Access. Detecting the End of a File. File Management Functions. Using Temporary Files.

Type & Run 5. Counting Characters.
Day 17. Manipulating Strings.

Determining String Length. Copying Strings. Concatenating Strings. Comparing Strings. Searching Strings. String Conversions. Miscellaneous String Functions. String-to-Number Conversions. Character Test Functions.

Day 18. Getting More from Functions.

Passing Pointers to Functions. Type void Pointers. Using Functions That Have a Variable Number of Arguments. Functions That Return a Pointer.

Day 19. Exploring the C Function Library.

Mathematical Functions. Dealing with Time. Error-Handling. Searching and Sorting.

Type & Run 6. Calculating Mortgage Payments.
Day 20. Working with Memory.

Type Conversions. Allocating Memory Storage Space. Manipulating Memory Blocks. Working with Bits.

Day 21. Advanced Compiler Use.

Programming with Multiple Source-Code Files. The C Preprocessor. Predefined Macros. Using Command-Line Arguments.

Week 3 In Review.


Where You're Going.

Bonus Day 1. Object-Oriented Programming Languages.

Procedural and Object-Oriented Languages. The Object-Oriented Constructs. The Java Programming Language. The C# Programming Language.

Bonus Day 2. The C++ Programming Language.

Hello C++ World! Understanding the C++ Keywords. The C++ Data Types. Declaring Variables in C++. Doing Operations in C++. Working with Functions in C++.

Bonus Day 3. Working with C++ Classes and Objects.

Working with Complex Data in C++. Using Classes. Creating Access Member Functions. Structures Versus Classes. Housekeeping with Classes. Starting with Constructors. Function Overloading Revisited. Review of the OOP Constructs in C++. Using Classes as Data Members. Inheriting in C++. A Caution on What You've Learned About C++.

Bonus Day 4. Java Language Fundamentals.

Structure of a Java Program. Java Program Essentials. Java Keywords. Java Identifiers. Data Types. Input and Output. Arrays. Operators. Flow Control.

Bonus Day 5. Working with Java Classes and Methods.

Defining a Class. Class Methods. Using Inheritance.

Bonus Day 6. More Java Techniques.

Working with Java Exceptions. Reading and Writing Files. Doing Graphics and Windows. Programming Java Applets.

Bonus Day 7. The C# Programming Language.

What Is C#? Why C#? C# Versus Other Programming Languages. Types of C# Programs. Creating a C# Program. Your First C# Program. Displaying Basic Information. C# and the Web.

Bonus Week. In Review.
Appendix A. ASCII Character Chart.
Appendix B. C/C++ Reserved Words.
Appendix C. Working with Binary and Hexadecimal Numbers

The Decimal Number System. The Binary System. The Hexadecimal System.

Appendix D. Portability Issues.

Guaranteeing ANSI Compatibility. Avoiding the ANSI Standard. Using Portable Numeric Variables. Portable Structures and Unions.

Appendix E. Common C Functions
Appendix F. Answers.
Appendix G. Getting Started with Dev-C++.

What is Dev-C++. Installing Dev-C++ on Microsoft Windows. The Dev-C++ Programs. Using Dev-C++.


More Information

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020