Status information, including various attributes, describes your free status, activities, contact information, schedule, location and comments (including "Personal" comments and "Out of Office" comments).
Preprocessing command:
ANSI C standard stipulates that some preprocessing commands can be added to the C source program to improve the programming environment and improve the programming efficiency. This kind of preprocessed pseudo-characters is uniformly specified by ANSI C, but it is not a part of C language itself, so they cannot be compiled directly.
The preprocessing command functions provided by C mainly include the following three types:
(1) macro definition.
(2) The file contains.
(3) Conditional compilation.
Pseudo commands are defined by macros, files containing commands, and conditional compilation commands. In order to distinguish them from general C statements, these commands are switched with the symbol #.