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The C programming Language

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The C programming Language

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    By Brian W. Kernighan and Dennis M. Ritchie.

    Published by Prentice-Hall in 1988

    ISBN 0-13-110362-8 (paperback)

    ISBN 0-13-110370-9

    ? Preface

    ? Preface to the first edition

    ? Introduction

    1. Chapter 1: A Tutorial Introduction

    1. Getting Started

    2. Variables and Arithmetic Expressions

    3. The for statement

    4. Symbolic Constants

    5. Character Input and Output

    1. File Copying

    2. Character Counting

    3. Line Counting

    4. Word Counting

    6. Arrays

    7. Functions

    8. Arguments - Call by Value

    9. Character Arrays

    10.External Variables and Scope 2. Chapter 2: Types, Operators and Expressions

    1. Variable Names

    2. Data Types and Sizes

    3. Constants

    4. Declarations

    5. Arithmetic Operators

    6. Relational and Logical Operators

    7. Type Conversions

    8. Increment and Decrement Operators

    9. Bitwise Operators

    10.Assignment Operators and Expressions

    11.Conditional Expressions

    12.Precedence and Order of Evaluation

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    3. Chapter 3: Control Flow

    1. Statements and Blocks

    2. If-Else

    3. Else-If

    4. Switch

    5. Loops - While and For

    6. Loops - Do-While

    7. Break and Continue

    8. Goto and labels

    4. Chapter 4: Functions and Program Structure

    1. Basics of Functions

    2. Functions Returning Non-integers 3. External Variables

    4. Scope Rules

    5. Header Files

    6. Static Variables

    7. Register Variables

    8. Block Structure

    9. Initialization

    10.Recursion

    11.The C Preprocessor

    1. File Inclusion

    2. Macro Substitution

    3. Conditional Inclusion

    5. Chapter 5: Pointers and Arrays 1. Pointers and Addresses

    2. Pointers and Function Arguments 3. Pointers and Arrays

    4. Address Arithmetic

    5. Character Pointers and Functions 6. Pointer Arrays; Pointers to Pointers

    7. Multi-dimensional Arrays 8. Initialization of Pointer Arrays 9. Pointers vs. Multi-dimensional Arrays

    10.Command-line Arguments

    11.Pointers to Functions

    12.Complicated Declarations

    6. Chapter 6: Structures

    1. Basics of Structures

    2. Structures and Functions 3. Arrays of Structures

    4. Pointers to Structures

    5. Self-referential Structures 6. Table Lookup

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     3 292 7. Typedef

    8. Unions

    9. Bit-fields

    7. Chapter 7: Input and Output

    1. Standard Input and Output 2. Formatted Output - printf 3. Variable-length Argument Lists 4. Formatted Input - Scanf 5. File Access

    6. Error Handling - Stderr and Exit 7. Line Input and Output

    8. Miscellaneous Functions

    1. String Operations

    2. Character Class Testing and Conversion

    3. Ungetc

    4. Command Execution

    5. Storage Management

    6. Mathematical Functions

    7. Random Number generation

    8. Chapter 8: The UNIX System Interface 1. File Descriptors

    2. Low Level I/O - Read and Write 3. Open, Creat, Close, Unlink 4. Random Access - Lseek

    5. Example - An implementation of Fopen and Getc

    6. Example - Listing Directories 7. Example - A Storage Allocator

    ? Appendix A: Reference Manual

    1. Introduction

    2. Lexical Conventions

    3. Syntax Notation

    4. Meaning of Identifiers

    5. Objects and Lvalues

    6. Conversions

    7. Expressions

    8. Declarations

    9. Statements

    10.External Declarations

    11.Scope and Linkage

    12.Preprocessor

    13.Grammar

    ? Appendix B: Standard Library

    1. Input and Output:

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    1. File Operations

    2. Formatted Output

    3. Formatted Input

    4. Character Input and Output Functions

    5. Direct Input and Output Functions

    6. File Positioning Functions

    7. Error Functions

    2. Character Class Tests: 3. String Functions: 4. Mathematical Functions: 5. Utility Functions: 6. Diagnostics:

    7. Variable Argument Lists: 8. Non-local Jumps:

    9. Signals:

    10.Date and Time Functions: 11.Implementation-defined Limits: and

    ? Appendix C: Summary of Changes

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    The computing world has undergone a revolution since the publication of The C Programming Language in 1978. Big computers are much bigger, and

    personal computers have capabilities that rival mainframes of a decade ago. During this time, C has changed too, although only modestly, and it has spread far beyond its origins as the language of the UNIX operating system.

    The growing popularity of C, the changes in the language over the years, and the creation of compilers by groups not involved in its design, combined to demonstrate a need for a more precise and more contemporary definition of the language than the first edition of this book provided. In 1983, the American National Standards Institute (ANSI) established a committee whose goal was to produce ``an unambiguous and

    machine-independent definition of the language C'', while still retaining its spirit. The result is the ANSI standard for C.

    The standard formalizes constructions that were hinted but not described in the first edition, particularly structure assignment and enumerations. It provides a new form of function declaration that permits cross-checking of definition with use. It specifies a standard library, with an extensive set of functions for performing input and output, memory management, string manipulation, and similar tasks. It makes precise the behavior of features that were not spelled out in the original definition, and at the same time states explicitly which aspects of the language remain machine-dependent.

    This Second Edition of The C Programming Language describes C as defined

    by the ANSI standard. Although we have noted the places where the language has evolved, we have chosen to write exclusively in the new form. For the most part, this makes no significant difference; the most visible change is the new form of function declaration and definition. Modern compilers already support most features of the standard.

    We have tried to retain the brevity of the first edition. C is not a big language, and it is not well served by a big book. We have improved the exposition of critical features, such as pointers, that are central to C programming. We have refined the original examples, and have added new examples in several chapters. For instance, the treatment of complicated declarations is augmented by programs that convert declarations into words and vice versa. As before, all examples have been tested directly from the text, which is in machine-readable form.

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    Appendix A, the reference manual, is not the standard, but our attempt to convey the essentials of the standard in a smaller space. It is meant for easy comprehension by programmers, but not as a definition for compiler writers -- that role properly belongs to the standard itself. Appendix B is a summary of the facilities of the standard library. It too is meant for reference by programmers, not implementers. Appendix C is a concise summary of the changes from the original version. As we said in the preface to the first edition, C ``wears well as one's experience with it grows''. With a decade more experience, we still feel that way. We hope that this book will help you learn C and use it well. We are deeply indebted to friends who helped us to produce this second edition. Jon Bently, Doug Gwyn, Doug McIlroy, Peter Nelson, and Rob Pike gave us perceptive comments on almost every page of draft manuscripts. We are grateful for careful reading by Al Aho, Dennis Allison, Joe Campbell, G.R. Emlin, Karen Fortgang, Allen Holub, Andrew Hume, Dave Kristol, John Linderman, Dave Prosser, Gene Spafford, and Chris van Wyk. We also received helpful suggestions from Bill Cheswick, Mark Kernighan, Andy Koenig, Robin Lake, Tom London, Jim Reeds, Clovis Tondo, and Peter Weinberger. Dave Prosser answered many detailed questions about the ANSI standard. We used Bjarne Stroustrup's C++ translator extensively for local testing of our programs, and Dave Kristol provided us with an ANSI C compiler for final testing. Rich Drechsler helped greatly with typesetting.

    Our sincere thanks to all.

    Brian W. Kernighan

    Dennis M. Ritchie

    C is a general-purpose programming language with features economy of expression, modern flow control and data structures, and a rich set of operators. C is not a ``very high level'' language, nor a ``big'' one, and is not specialized to any particular area of application. But its absence of restrictions and its generality make it more convenient and effective for many tasks than supposedly more powerful languages. C was originally designed for and implemented on the UNIX operating system on the DEC PDP-11, by Dennis Ritchie. The operating system, the C compiler, and essentially all UNIX applications programs (including all of the software used to prepare this book) are written in C. Production compilers

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    also exist for several other machines, including the IBM System/370, the Honeywell 6000, and the Interdata 8/32. C is not tied to any particular hardware or system, however, and it is easy to write programs that will run without change on any machine that supports C.

    This book is meant to help the reader learn how to program in C. It contains a tutorial introduction to get new users started as soon as possible, separate chapters on each major feature, and a reference manual. Most of the treatment is based on reading, writing and revising examples, rather than on mere statements of rules. For the most part, the examples are complete, real programs rather than isolated fragments. All examples have been tested directly from the text, which is in machine-readable form. Besides showing how to make effective use of the language, we have also tried where possible to illustrate useful algorithms and principles of good style and sound design.

    The book is not an introductory programming manual; it assumes some familiarity with basic programming concepts like variables, assignment statements, loops, and functions. Nonetheless, a novice programmer should be able to read along and pick up the language, although access to more knowledgeable colleague will help.

    In our experience, C has proven to be a pleasant, expressive and versatile language for a wide variety of programs. It is easy to learn, and it wears well as on's experience with it grows. We hope that this book will help you to use it well.

    The thoughtful criticisms and suggestions of many friends and colleagues have added greatly to this book and to our pleasure in writing it. In particular, Mike Bianchi, Jim Blue, Stu Feldman, Doug McIlroy Bill Roome, Bob Rosin and Larry Rosler all read multiple volumes with care. We are also indebted to Al Aho, Steve Bourne, Dan Dvorak, Chuck Haley, Debbie Haley, Marion Harris, Rick Holt, Steve Johnson, John Mashey, Bob Mitze, Ralph Muha, Peter Nelson, Elliot Pinson, Bill Plauger, Jerry Spivack, Ken Thompson, and Peter Weinberger for helpful comments at various stages, and to Mile Lesk and Joe Ossanna for invaluable assistance with typesetting.

    Brian W. Kernighan

    Dennis M. Ritchie

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    C is a general-purpose programming language. It has been closely associated with the UNIX operating system where it was developed, since both the system and most of the programs that run on it are written in C. The language, however, is not tied to any one operating system or machine; and although it has been called a ``system programming language'' because it is useful for writing compilers and operating systems, it has been used equally well to write major programs in many different domains. Many of the important ideas of C stem from the language BCPL, developed by Martin Richards. The influence of BCPL on C proceeded indirectly through the language B, which was written by Ken Thompson in 1970 for the first UNIX system on the DEC PDP-7.

    BCPL and B are ``typeless'' languages. By contrast, C provides a variety of data types. The fundamental types are characters, and integers and floating point numbers of several sizes. In addition, there is a hierarchy of derived data types created with pointers, arrays, structures and unions. Expressions are formed from operators and operands; any expression, including an assignment or a function call, can be a statement. Pointers provide for machine-independent address arithmetic.

    C provides the fundamental control-flow constructions required for well-structured programs: statement grouping, decision making (if-else), selecting one of a set of possible values (switch), looping with the termination test at the top (while, for) or at the bottom (do), and early loop exit (break).

    Functions may return values of basic types, structures, unions, or pointers. Any function may be called recursively. Local variables are typically ``automatic'', or created anew with each invocation. Function definitions may not be nested but variables may be declared in a block-structured fashion. The functions of a C program may exist in separate source files that are compiled separately. Variables may be internal to a function, external but known only within a single source file, or visible to the entire program.

    A preprocessing step performs macro substitution on program text, inclusion of other source files, and conditional compilation. C is a relatively ``low-level'' language. This characterization is not pejorative; it simply means that C deals with the same sort of objects that most computers do, namely characters, numbers, and addresses. These may be combined and moved about with the arithmetic and logical operators implemented by real machines.

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    C provides no operations to deal directly with composite objects such as character strings, sets, lists or arrays. There are no operations that manipulate an entire array or string, although structures may be copied as a unit. The language does not define any storage allocation facility other than static definition and the stack discipline provided by the local variables of functions; there is no heap or garbage collection. Finally, C itself provides no input/output facilities; there are no READ or WRITE statements, and no built-in file access methods. All of these higher-level mechanisms must be provided by explicitly called functions. Most C implementations have included a reasonably standard collection of such functions.

    Similarly, C offers only straightforward, single-thread control flow: tests, loops, grouping, and subprograms, but not multiprogramming, parallel operations, synchronization, or coroutines.

    Although the absence of some of these features may seem like a grave deficiency, (``You mean I have to call a function to compare two character strings?''), keeping the language down to modest size has real benefits. Since C is relatively small, it can be described in small space, and learned quickly. A programmer can reasonably expect to know and understand and indeed regularly use the entire language.

    For many years, the definition of C was the reference manual in the first edition of The C Programming Language. In 1983, the American National

    Standards Institute (ANSI) established a committee to provide a modern, comprehensive definition of C. The resulting definition, the ANSI standard, or ``ANSI C'', was completed in late 1988. Most of the features of the standard are already supported by modern compilers. The standard is based on the original reference manual. The language is relatively little changed; one of the goals of the standard was to make sure that most existing programs would remain valid, or, failing that, that compilers could produce warnings of new behavior.

    For most programmers, the most important change is the new syntax for declaring and defining functions. A function declaration can now include a description of the arguments of the function; the definition syntax changes to match. This extra information makes it much easier for compilers to detect errors caused by mismatched arguments; in our experience, it is a very useful addition to the language. There are other small-scale language changes. Structure assignment and enumerations, which had been widely available, are now officially part of the language. Floating-point computations may now be done in single

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    precision. The properties of arithmetic, especially for unsigned types, are clarified. The preprocessor is more elaborate. Most of these changes will have only minor effects on most programmers.

    A second significant contribution of the standard is the definition of a library to accompany C. It specifies functions for accessing the operating system (for instance, to read and write files), formatted input and output, memory allocation, string manipulation, and the like. A collection of standard headers provides uniform access to declarations of functions in data types. Programs that use this library to interact with a host system are assured of compatible behavior. Most of the library is closely modeled on the ``standard I/O library'' of the UNIX system. This library was described in the first edition, and has been widely used on other systems as well. Again, most programmers will not see much change. Because the data types and control structures provided by C are supported directly by most computers, the run-time library required to implement self-contained programs is tiny. The standard library functions are only called explicitly, so they can be avoided if they are not needed. Most can be written in C, and except for the operating system details they conceal, are themselves portable.

    Although C matches the capabilities of many computers, it is independent of any particular machine architecture. With a little care it is easy to write portable programs, that is, programs that can be run without change on a variety of hardware. The standard makes portability issues explicit, and prescribes a set of constants that characterize the machine on which the program is run.

    C is not a strongly-typed language, but as it has evolved, its type-checking has been strengthened. The original definition of C frowned on, but permitted, the interchange of pointers and integers; this has long since been eliminated, and the standard now requires the proper declarations and explicit conversions that had already been enforced by good compilers. The new function declarations are another step in this direction. Compilers will warn of most type errors, and there is no automatic conversion of incompatible data types. Nevertheless, C retains the basic philosophy that programmers know what they are doing; it only requires that they state their intentions explicitly.

    C, like any other language, has its blemishes. Some of the operators have the wrong precedence; some parts of the syntax could be better. Nonetheless, C has proven to ben an extremely effective and expressive language for a wide variety of programming applications.

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