主题：复杂的if 嵌套的关系，请老师指导

if holding>0 then begin
                条件1
                条件2
                if 条件3  then begin   
                                   sell(holding>0,1,market);
                                      end                  
                 if 条件4 then begin
                                  sell(holding>0,1,market);
                              
                                      end;

                 if 条件5 then
                       sell(holding>0,1,market);
                end;

第一个if 和begin-end 如果要去掉的话，改写成这样,是等效的。

if 条件3  and holding>0 then

begin   
sell(holding>0,1,market);
end  

               
if 条件4 and holding>0 then

begin
sell(holding>0,1,market);                              
end;

 if 条件5  and holding>0 then sell(holding>0,1,market);