[Marcel]

You should either use COLOR_GREEN or the hex code. Not both of them. So use

pawn Код:

SendClientMessage(playerid,COLOR_GREEN,"Hello");

or

pawn Код:

SendClientMessage(playerid,0xFFFFFF,"Hello");

print is to display something in the server window, also shows up in server_log.txt. With define you can do

pawn Код:

#define hellomessage "hello you"

Now you can use hellomessage instead of "hello you".
With #if defined you can check if you defined something. With this you can do

pawn Код:

#define filterscript

then check with

pawn Код:

#if defined filterscript

wether you have to run OnGameModeInit or OnFilterScriptInit