[Kimossab]

after the else{ and before the format put this:

pawn Код:

for(new i = 0; i<MAX_PLAYERS; i++)
if(LottoNumber[i] == number)
return SendClientMessage(playerid, -1, "That number is already taken by some player.");

Edit: Actually that else is useless, remove it and put that code ^ in it's place, so it should look like this:

pawn Код:

COMMAND:lotto(playerid, params[])
{
    new string[256], number;
    if(sscanf(params, "d", number)) return SendClientMessage(playerid, -1, "Syntax: {FF9900}/lotto [1 - 80]"); 
    if(LottoNumber[playerid] > 0) return SendClientMessage(playerid, -1, "You already have a lotto number.");
    if(number < 1 || number > 80) return SendClientMessage(playerid, -1, "Invalid lotto number. Number must be between 1 and 80.");
    if(LottoNum == 0) return SendClientMessage(playerid, -1, "There is not a lottery going on."); 
    for(new i = 0; i<MAX_PLAYERS; i++)
        if(LottoNumber[i] == number)
            return SendClientMessage(playerid, -1, "That number is already taken by some player.");
    format(string, sizeof(string), "You picked number %d for the lottery.", number);
    SendClientMessage(playerid, -1, string); 
    LottoNumber[playerid] = number;
    GivePlayerMoney(playerid, -100);
    return 1;
}