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Definition

#define <what to define> [<what it will be>]

Defines what to define as what it will be. This means that after this line, all what to defines will be "replaced" by what it will be.

Example

In the following example, we'll show it is possible to define words as "being" basic statements.

#define StartThisShow Program
#define GimmeSomeShit Process

StartThisShow example;
Begin
    proc();
End

GimmeSomeShit proc()
Begin
End

Used in example: Program, Process, Begin, End

Error codes are handy as well, like used in Network.DLL and LCD.DLL:

#define NET_ERROR_INVALIDADDRESS -12

This will enable the use of NET_ERROR_INVALIDADDRESS as it it were the value -12. This makes it much more clear for the programmer what the errors are. Consider this:

#define NET_STATUS_ESTABLISHED 2

The value 2 on itself means very little, but NET_STATUS_ESTABLISHED immediately makes it clear what it means.