主题：请求编写代码

variable:chushi=0,diff1=0;

if chushi=0 and close>ma(c,20) and "macd.diff">"macd.dea" then
begin
  sellshort(holding<0,0,market);
  buy(holding=0,2,market);
  chushi:=c;
end
//止损止赢出场参照前三根k线最低价
if  c<llv(l,3) then
begin
sell(holding>0,1,market);
diff1:=chushi-c;
end
//一手单将在与开仓点位与止损点价差同样的距离止赢一手
if c<chushi-diff1 then sell(holding>0,1,market);
if c>chushi+diff1 then sell(holding>0,1,market);
if ENTERBARS>1 and c<chushi-2*diff1 then sell(holding>0,1,market);
if ENTERBARS>1 and c>chushi+2*diff1 then sell(holding>0,1,market);