[Eth]

-- means it will decrease the amount of something by 1

and ++ means it will increase the amount of something by 1.

here is an example:

pawn Код:

public OnPlayerDeath(playerid, killerid, reason)
{
PlayerDeath[playerid] ++; // increase the player death by one
PlayerScore[playerid] --; //will decrease the player  score by one
return 1;
}

and its the same as:

pawn Код:

public OnPlayerDeath(playerid, killerid, reason)
{
PlayerDeath[playerid] += 1; // increase the player death by one
PlayerScore[playerid] -= 1; //will decrease the player  score by one
return 1;
}