[Mauzen]

Using switch is indeed the best thing here. But to answer the else-question: Else is a good thing to use here, as it can safe you 50% of the conditions and so optimizes the code a lot:

pawn Код:

stock UpdateRank(playerid)
{
    new string[128];
    if(PInfo[playerid][Owner] == 1) return format(pRank[playerid],128,"Server Owner");
    if(PInfo[playerid][Level] < 500) return format(pRank[playerid],128,"Administrator");
    if(PInfo[playerid][Missionspassed] >= 0 && PInfo[playerid][Missionspassed] < 10) return format(pRank[playerid],128,"New Trucker");
    else if(/*PInfo[playerid][Missionspassed] >= 10 && */PInfo[playerid][Missionspassed] < 25) return format(pRank[playerid],128,"Trucker");
    else if(/*PInfo[playerid][Missionspassed] >= 25 && */PInfo[playerid][Missionspassed] < 45) return format(pRank[playerid],128,"Advancing Trucker");
    // first condition is already checked, so not needed
    // ...
}