作者：未知 来源：月光软件站 加入时间：2005-2-28　月光软件站

2.3. #defines as constants

C and C++ use #defines in several ways. In a C header file #define can be used

• for declaring a constant
• for declaring a symbol for conditional compilation
• for macros

This chapter describes the translation of #define into Delphi constants.

The format for declaring constants in C is:

#define NameOfConstant Value 

For example:

#define TIME_ZONE_ID_UNKNOWN 0 



#define TIME_ZONE_ID_STANDARD 1



#define TIME_ZONE_ID_DAYLIGHT 2

The translation in Delphi is:

CONST



  TIME_ZONE_ID_UNKNOWN = 0;



  TIME_ZONE_ID_STANDARD = 1;



  TIME_ZONE_ID_DAYLIGHT = 2;

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2.3.1. Hexadecimal values

C uses the prefix 0x to specify a hexadecimal value. For example, the C declaration

#define MY_CONSTANT 0xFF 

translates to Delphi as

CONST



  MY_CONSTANT = $FF;

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