C Language Reference Manual

Table of Contents

New Features

About This Manual

Related Publications

Obtaining Publications

Conventions

Reader Comments

1. An Overview of ANSI C

ANSI C

Helpful Programming Hints

2. C Language Changes

Preprocessor Changes

Changes in Disambiguating Identifiers

Types and Type Compatibility

Function Prototypes

External Name Changes

Standard Headers

3. Lexical Conventions

Comments

Identifiers

Keywords

Constants

String Literals

Operators

Punctuators

4. Meaning of Identifiers

Disambiguating Names

Object Types

Objects and lvalues

5. Operator Conversions

Conversions of Characters and Integers

Conversions of Float and Double

Conversion of Floating and Integral Types

Conversion of Pointers and Integers

Conversion of unsigned Integers

Arithmetic Conversions

Conversion of Other Operands

6. Expressions and Operators

Precedence and Associativity Rules in C

Primary Expressions

Postfix Expressions

Unary Operators

Cast Operators

Multiplicative Operators

Additive Operators

Shift Operators

Relational Operators

Equality Operators

Bitwise AND Operator

Bitwise Exclusive OR Operator

Bitwise Inclusive OR Operator

Logical AND Operator

Logical OR Operator

Conditional Operator

Assignment Operators

Comma Operator

Constant Expressions

Integer and Floating Point Exceptions

7. Declarations

Storage Class Specifiers

Type Specifiers

Structure and Union Declarations

Bitfields

Enumeration Declarations

Type Qualifiers

Declarators

Type Names

Implicit Declarations

typedef

Initialization

8. Statements

Expression Statement

Compound Statement or Block

Selection Statements

Iteration Statements

Jump Statements

Labeled Statements

9. External Definitions

External Function Definitions

External Object Definitions

10. Multiprocessing Directives

OpenMP C/C++ API Multiprocessing Directives

Using Parallel Regions

Parallel Regions

Parallel Reduction Operations in C and C++

Restrictions for the C++ Compiler

11. Multiprocessing Advanced Features

Run-time Library Routines

Run-time Environment Variables

Communicating Between Threads Through Thread Local Data

Synchronization Intrinsics

12. Parallel Programming on Origin Servers

Performance Tuning of Parallel Programs on an Origin2000 Server

Types of Data Distribution

Affinity Scheduling

Directives for Performance Tuning on Origin2000

Query Intrinsics for Distributed Arrays

Optional Environment Variables and Compile-Time Options

Examples

13. The Auto-Parallelizing Option (APO)

A. Implementation-Defined Behavior

Translation (F.3.1)

Environment (F.3.2)

Identifiers (F.3.3)

Characters (F.3.4)

Integers (F.3.5)

Floating Point (F.3.6)

Arrays and Pointers (F.3.7)

Registers (F.3.8)

Structures, Unions, Enumerations, and Bitfields (F.3.9)

Qualifiers (F.3.10)

Declarators (F.3.11)

Statements (F.3.12)

Preprocessing Directives (F.3.13)

Library Functions (F.3.14)

Locale-Specific Behavior (F.4)

Common Extensions (F.5)

B. lint-style Comments

C. Built-in Functions