[Mean]

If you for example see a code like this:

pawn Код:

new gPlayerRank[ MAX_PLAYERS + 1 ];

That is useless if you have defined MAX_PLAYERS the correct way, because it starts counting from 0 so that + 1 is not needed.

It is useful in some cases, for example:

pawn Код:

#define NUMBER_OF_TEAMS 2

CMD:removemyteam( playerid, params[ ] ) {
    SetPlayerTeam( playerid, NUMBER_OF_TEAMS + playerid + 1 );
    return 1;
}

You can use the NO_TEAM(or something like that) define instead, but I was just giving an example.