不用动态函数精确选出涨跌停板

a1:=ref(c,1)*0.9*100;
a3:=FRACPART(a1)*10;
b1:=1; b2:=0;
a4:=if(a3>=5,b1,b2);
a5:=INTPART(a1);
a6:=(a5+a4)/100;
a7:c=a6;
跌停

a1:=ref(c,1)*1.1*100;
a3:=FRACPART(a1)*10;
b1:=1; b2:=0;
a4:=if(a3>=5,b1,b2);
a5:=INTPART(a1);
a6:=(a5+a4)/100;
a7:c=a6;
涨停