Directive (programming): Difference between revisions

Revision as of 23:00, 17 September 2004

Revision as of 21:43, 5 January 2006

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==Overview==

Directives are used in several relatively low-level languages such as [[assembly programming]], [[C programming language|C]] and [[C plus plus|C++]]. In [[assembly language]], directives generally tell the assembler the target platform, delineate segments, and so on. In [[C plus plus|C++]], directives are used for conditional compiling, macros and including other files.

Directives are used in several relatively low-level languages such as [[assembly programming]], [[C programming language|C]] and [[C plus plus|C++]]. In [[assembly language]], directives generally tell the assembler the target platform, delineate segments, and so on. In [[C plus plus|C++]], directives are used for conditional compiling, macros and including other files.

==Examples==

===C/C++===

There are several preprocessor directives in [[C programming language|C]] and [[C plus plus|C++]]. The following are a few examples, but do not illustrate every directive or every situation in which one might find them. Note the lack of semicolons at the end of the lines: directives are instructions to the preprocessor, not the compiler, and they follow their own language grammar and rules.

There are several preprocessor directives in [[C programming language|C]] and [[C plus plus|C++]]. The following are a few examples, but do not illustrate every directive or every situation in which one might find them. Note the lack of semicolons at the end of the lines: directives are instructions to the preprocessor, not the compiler, and they follow their own language grammar and rules.

#include <iostream>