#include <a_samp>//its already present in every FS
#pragma tabsize 0//if it is not present in the script so it may give you "loose indentation." or if your scripting is in correct sequence so no need to add it

    #define RC_BANDIT    441
    #define RC_BARON  464
    #define RC_GOBLIN  501
    #define RC_RAIDER  465
    #define D_TRAM   449
    #define RC_MINITANK   564
    #define RC_CAM   594

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{

    if(newkeys == KEY_SECONDARY_ATTACK ){//the secondary attack key ,which you can change into your own choice
        if(!IsPlayerInAnyVehicle(playerid)){ //checks the player if he/she is in the vehicle.
            new Float:x, Float:y, Float:z, vehicle; //these Float gets the player position that where the player is present
            GetPlayerPos(playerid, x, y, z );//gets player position
            GetVehicleWithinDistance(playerid, x, y, z, 20.0, vehicle);//gets the player distance from the vehicle

            if(IsVehicleRc(vehicle)){ //it checks the player vehicle is RC or not .
              PutPlayerInVehicle(playerid, vehicle, 0);
            }
        }

        else {
            new vehicleID = GetPlayerVehicleID(playerid);
            if(IsVehicleRc(vehicleID) || GetVehicleModel(vehicleID) == RC_CAM){
              if(GetVehicleModel(vehicleID) != D_TRAM){
                new Float:x, Float:y, Float:z;
                GetPlayerPos(playerid, x, y, z);
                SetPlayerPos(playerid, x+0.5, y, z+1.0);
                }
            }
        }
    }
}

GetVehicleWithinDistance( playerid, Float:x1, Float:y1, Float:z1, Float:dist, &veh){//It should be in script other wise the GetVehicleWithInDistance will not work
    for(new i = 1; i < MAX_VEHICLES; i++){
        if(GetVehicleModel(i) > 0){
            if(GetPlayerVehicleID(playerid) != i ){
            new Float:x, Float:y, Float:z;
            new Float:x2, Float:y2, Float:z2;
            GetVehiclePos(i, x, y, z);
            x2 = x1 - x; y2 = y1 - y; z2 = z1 - z;
            new Float:vDist = (x2*x2+y2*y2+z2*z2);
            if( vDist < dist){
            veh = i;
            dist = vDist;
                }
            }
        }
    }
}

IsVehicleRc( vehicleid ){//defines the RC vehicles.
  new model = GetVehicleModel(vehicleid);
  switch(model){
  case RC_GOBLIN, RC_BARON, RC_BANDIT, RC_RAIDER, RC_MINITANK: return 1;
  default: return 0;
    }

  return 0;
}