[SymonClash]

Thanks, did in this way and it's working now.

pawn Код:

CMD:fight(playerid, params[])
{
    new wep_id, string[100], gunname[32];

    if(sscanf(params, "d", wep_id)) return SCM(playerid, COLOR_GREEN, "* [USAGE]: /fight [weapon id]");
    
    GetWeaponName(wep_id, gunname, sizeof(gunname));
    
    switch(wep_id)
    {
        case 0, 1, 14, 17, 19, 20, 21, 40, 43, 44, 45, 46: return SCM(playerid, COLOR_RED, "* Invalid weapon ID.");
    }

    foreach(new i : Player)
    {
        GivePlayerWeapon(i, wep_id, 9999);
        format(string, sizeof(string), "~g~%s ~w~fight!", gunname);
        GameTextForPlayer(i, string, 3000, 4);
    }
    return 1;
}

As you can see, i restriced some wep ids to be given, but i can still do /fight 50 or even /fight 500 ...

How to add your sanity checks?