A preprocessor directive is any line of an LPC program which begins with ‘#’.
These aren’t really actually statements; they just instruct the compiler to do certain things while compiling the code. For example, the #if statement can be used to compile certain sections of the code only if certain conditions are true.
This is a companion discussion topic for the original entry at https://www.fluffos.info/lpc/preprocessor/README.html#gsc.tab=0