Reference number
ISO/IEC 9899:1999(E)
©
ISO/IEC 1999
INTERNATIONAL
STANDARD
ISO/IEC
9899
Second edition
1999-12-01
Programming languages — C
Langages de programmation — C
Processed and adopted by ASC the National Committee for
Information Technology Standards (NCITS) and approved by
ANSI as an American National Standard.
Date of ANSI Approval: 5/22/2000
Published by American National Standards Institute,
11 West 42nd Street, New York, New York 10036
Copyright 2000 by Information Technology Industry Council
(ITI). All rights reserved.
These materials are subject to copyright claims of International
Standardization Organization (ISO), International Electrotechnical
Commission (IEC), American National Standards Institute (ANSI),
and Information Technology Industry Council (ITI). Not for resale.
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including an electronic retrieval system, without the prior written
permission of ITI. All requests pertaining to this standard should be
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Printed in the United States of America
ISO/IEC 9899:1999(E)
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ii © ISO/IEC 1999 – All rights reserved
©ISO/IEC ISO/IEC 9899:1999 (E)
Contents
Foreword ............................. xi
Introduction ............................ xiv
1. Scope ............................. 1
2. Normative references ....................... 2
3. Terms, definitions, and symbols ................... 3
4. Conformance .......................... 7
5. Environment .......................... 9
5.1 Conceptual models ..................... 9
5.1.1 Translation environment ................ 9
5.1.2 Execution environments ................ 11
5.2 Environmental considerations ................. 17
5.2.1 Character sets .................... 17
5.2.2 Character display semantics .............. 19
5.2.3 Signals and interrupts ................. 20
5.2.4 Environmental limits ................. 20
6. Language ............................ 29
6.1 Notation .......................... 29
6.2 Concepts ......................... 29
6.2.1 Scopes of identifiers ................. 29
6.2.2 Linkages of identifiers ................. 30
6.2.3 Name spaces of identifiers ............... 31
6.2.4 Storage durations of objects .............. 32
6.2.5 Types ....................... 33
6.2.6 Representations of types ................ 37
6.2.7 Compatible type and composite type ........... 40
6.3 Conversions ........................ 42
6.3.1 Arithmetic operands ................. 42
6.3.2 Other operands ................... 46
6.4 Lexical elements ...................... 49
6.4.1 Keywords ...................... 50
6.4.2 Identifiers ...................... 51
6.4.3 Universal character names ............... 53
6.4.4 Constants ...................... 54
6.4.5 String literals .................... 62
6.4.6 Punctuators ..................... 63
6.4.7 Header names .................... 64
6.4.8 Preprocessing numbers ................ 65
6.4.9 Comments ..................... 66
6.5 Expressions ........................ 67
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ISO/IEC 9899:1999 (E) ©ISO/IEC
6.5.1 Primary expressions ................. 69
6.5.2 Postfix operators ................... 69
6.5.3 Unary operators ................... 78
6.5.4 Cast operators .................... 81
6.5.5 Multiplicative operators ................ 82
6.5.6 Additive operators .................. 82
6.5.7 Bitwise shift operators ................. 84
6.5.8 Relational operators .................. 85
6.5.9 Equality operators .................. 86
6.5.10 Bitwise
AND operator ................. 87
6.5.11 Bitwise exclusive
OR operator ............. 88
6.5.12 Bitwise inclusive
OR operator .............. 88
6.5.13 Logical
AND operator ................. 89
6.5.14 Logical
OR operator ................. 89
6.5.15 Conditional operator ................. 90
6.5.16 Assignment operators ................. 91
6.5.17 Comma operator ................... 94
6.6 Constant expressions ..................... 95
6.7 Declarations ........................ 97
6.7.1 Storage-class specifiers ................ 98
6.7.2 Type specifiers .................... 99
6.7.3 Type qualifiers ....................108
6.7.4 Function specifiers ..................112
6.7.5 Declarators .....................114
6.7.6 Type names .....................122
6.7.7 Type definitions ...................123
6.7.8 Initialization ....................125
6.8 Statements and blocks ....................131
6.8.1 Labeled statements ..................131
6.8.2 Compound statement .................132
6.8.3 Expression and null statements .............132
6.8.4 Selection statements .................133
6.8.5 Iteration statements ..................135
6.8.6 Jump statements ...................136
6.9 External definitions .....................140
6.9.1 Function definitions ..................141
6.9.2 External object definitions ...............143
6.10 Preprocessing directives ...................145
6.10.1 Conditional inclusion .................147
6.10.2 Source file inclusion .................149
6.10.3 Macro replacement ..................151
6.10.4 Line control .....................158
6.10.5 Error directive ....................159
6.10.6 Pragma directive ...................159
iv Contents
©ISO/IEC ISO/IEC 9899:1999 (E)
6.10.7 Null directive ....................160
6.10.8 Predefined macro names ................160
6.10.9 Pragma operator ...................161
6.11 Future language directions ..................163
6.11.1 Floating types ....................163
6.11.2 Linkages of identifiers .................163
6.11.3 External names ...................163
6.11.4 Character escape sequences ..............163
6.11.5 Storage-class specifiers ................163
6.11.6 Function declarators .................163
6.11.7 Function definitions ..................163
6.11.8 Pragma directives ..................163
6.11.9 Predefined macro names ................163
7. Library .............................164
7.1 Introduction ........................164
7.1.1 Definitions of terms ..................164
7.1.2 Standard headers ...................165
7.1.3 Reserved identifiers ..................166
7.1.4 Use of library functions ................166
7.2 Diagnostics <assert.h> ..................169
7.2.1 Program diagnostics .................169
7.3 Complex arithmetic <complex.h> ..............170
7.3.1 Introduction .....................170
7.3.2 Conventions .....................171
7.3.3 Branch cuts .....................171
7.3.4 The CX_LIMITED_RANGE pragma ...........171
7.3.5 Trigonometric functions ................172
7.3.6 Hyperbolic functions .................174
7.3.7 Exponential and logarithmic functions ..........176
7.3.8 Power and absolute-value functions ...........177
7.3.9 Manipulation functions ................178
7.4 Character handling <ctype.h> ................181
7.4.1 Character classification functions ............181
7.4.2 Character case mapping functions ............184
7.5 Errors <errno.h> .....................186
7.6 Floating-point environment <fenv.h> .............187
7.6.1 The FENV_ACCESS pragma ..............189
7.6.2 Floating-point exceptions ...............190
7.6.3 Rounding ......................192
7.6.4 Environment ....................194
7.7 Characteristics of floating types <float.h> ...........196
7.8 Format conversion of integer types <inttypes.h> ........197
7.8.1 Macros for format specifiers ..............197
7.8.2 Functions for greatest-width integer types .........198
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