HP C
User's Guide for OpenVMS Systems

Appendix A
Appendix A	Migrating from VAX C
A.1	Features Affecting the Compiler
A.1.1	HP C Qualifiers
A.1.2	Comment Processing
A.1.3	String Literal Concatenation
A.1.4	Recursive main() Function
A.1.5	Trigraph Sequences
A.1.6	Alert Escape Sequence
A.1.7	Hexadecimal Escape Sequence
A.1.8	Invalid Escape Sequences
A.1.9	$ in Macro Names
A.1.10	Null Arguments to Macros
A.1.11	Standard C Name Space Conformance
A.1.11.1	Nonstandard Keywords
A.1.11.2	Nonstandard Predefined Macros
A.1.11.3	Nonstandard Identifiers in Standard-Specified Header Files
A.1.12	HP C Predefined Macros
A.1.13	HP C Types
A.1.13.1	signed Reserved Word
A.1.13.2	Removal of the long float Type
A.1.13.3	Addition of the long double Type
A.1.13.4	Addition of Processor-Specific Integer Data Types
A.1.14	Type Compatibility
A.1.15	Composite Types
A.1.16	Enumerations Have Type int
A.1.17	long double Constants
A.1.18	Implicit Unsigned Integer Constants
A.1.18.1	OpenVMS VAX Systems
A.1.18.2	OpenVMS Alpha Systems
A.1.19	Multibyte and Wide Character Support
A.1.19.1	The Wide Character Type
A.1.19.2	Multibyte Characters in Comments, Character Constants, and String Literals
A.1.19.3	Wide Character Constants
A.1.19.4	Wide String Literals
A.1.20	Usual Arithmetic Conversions
A.1.21	Indexing as a Commutative Operator
A.1.22	Cast Operators
A.1.23	Function Calls
A.1.23.1	Assignment Compatibility Argument Checking
A.1.23.2	Passing Narrow Types to Old Syntax Functions
A.1.24	"Address of" Operator
A.1.25	Unary Plus
A.1.26	Relational Operators
A.1.27	Assignment Compatibility
A.1.28	Declarations
A.1.28.1	Implementation Limits
A.1.28.2	Identifier Name Length
A.1.28.3	Diagnosing Empty Declarations
A.1.28.4	Restriction on Placement of Storage-Class Specifiers
A.1.28.5	Diagnosing Old-Style Function Declarations
A.1.28.6	Function Definitions Using typedef-names
A.1.28.7	Initialization
A.1.29	Bit-Field Initialization
A.1.30	The Preprocessor
A.1.30.1	White Space Appearing Before the #
A.1.30.2	The #define Directive and Macro Substitution
A.1.30.3	The #line Directive
A.1.30.4	The #error Directive
A.1.30.5	The #pragma builtins Directive
A.1.30.6	The #pragma dictionary Directive
A.1.30.7	The #pragma extern_model Directive
A.1.30.8	The #pragma linkage Directive (ALPHA ONLY)
A.1.30.9	The #pragma use_linkage Directive (ALPHA ONLY)
A.1.30.10	The #pragma message Directive
A.1.30.11	The #pragma module Directive
A.2	Features Affecting the HP C Run-Time Library and Include Files
A.2.1	<stddef.h>
A.2.2	<ctype.h>
A.2.3	<fp_class.h>
A.2.4	<locale.h>
A.2.5	<math.h>
A.2.6	<signal.h>
A.2.7	<stdio.h>
A.2.8	<stdlib.h>
A.2.9	<string.h>
A.2.10	<time.h>
A.3	Unsupported Features