标题：[求助]如何编写以下语句

模型大概如下，

variable:n=0;

ma60:ma(c,60);

if holding=0 and cross(ma60,c) and n=0 then begin

     buyshort(1,1,limitr,close);

     n:=1;

end

 

if holding=0 and cross(c,ma60) and n=0 then begin

     buy(1,1,limitr,close);

     n:=1;

end

 

if cross(c,ma60) then sellshort(1,0,limitr,close);

 

if cross(ma60,c) then sell(1,0,limitr,lcose);

 

if holding=0 and cross(c,ma60) and n=1 and exitbars>20 then buy(1,1,limitr,close);

 

if holding=0 and cross(ma60,c) and n=1 and exitbars>20 then buyshort(1,1,limitr,close);