MQL4 Reference 
Basics Preprocessor
Preprocessor is a special subsystem of MQL4 compiler that is intended for preparation of the program source code immediately
before the program is compiled.
Preprocessor allows enhancement of the source code readability. The code can be structured by including of specific
files containing source codes of MQL4 programs. The possibility to assign mnemonic names to specific constants contributes to enhancement of the code readability.
Preprocessor also allows determining of specific parameters of MQL4 programs.
If the # symbol is used in the first line of the program, this line is a preprocessor directive.
A preprocessor directive ends with a line feed character.
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