主题：请教关于止盈止损的写法

variable:n=0;
IF HOLDING=0 AND 多头条件 THEN BEGIN
BUY(1,1,THISCLOSE);
n:=h;
END

if enterbars>0 and holding>0 and L<avgenterprice-10*mindiff then sell(1,0,THISCLOSE); //止损

if h>n then n:=h;

if enterbars>0 and holding>0 and n-avgenterprice>50*mindiff and nn-avgenterprice<100*mindiff and h-avgenterprice<0.5*(n-avgenterprice) then sell(1,0,THISCLOSE); //止盈

if enterbars>0 and holding>0 and n-avgenterprice>100*mindiff and h-avgenterprice>100*mindiff and h-avgenterprice<0.5*M then sell(1,0,THISCLOSE); //折返止盈

写成这样后，为啥老提示“变量名N重复”呢