#define ~ Online tutorial

#define (directive)

Defines a macro

Syntax:

#define <id1>[ ( <id2>, ... ) ] <token string>

The #define directive defines a macro.

Macros provide a mechanism for token replacement with or without a set of

formal, function-line parameters.

All subsequent instances of the identifier <id1> in the source text will be

replaced by the text defined by <token string>.

Example:

#define MAXINT 32767

#define ctrl(x) ((x) \

- 64) /* continued from preceding line */

It is legal but ill-advised to use Turbo C++ keywords as macro identifiers.

For example,

#define int long

is legal, but possibly catastrophic.

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