bool  IsDailyLimit = false;

float Open = 11.23, High = 11.23, Low = 11.23, Close = 11.23, YClose = 10.21;

if(Open == High

  && Open == Low

  && Open == Close

  && Low > 1.09 * YClose)//一字涨停判断

{

　　IsDailyLimit  = true;
}

注意：不要写成 Open == High == Low == Close

判断多个数值都相等