為甚麼指標無法正常顯示，程式加上這行指令 #property strict ，就無法正常顯示

[andy662785]

#property version   "1.00"

#property strict

#property indicator_chart_window

#property indicator_buffers 3

#property indicator_color1 DarkGray

#property indicator_style1 2

#property indicator_color2 DarkGray

#property indicator_style2 2

#property indicator_color3 DarkGray

#property indicator_style3 2

//---- indicator parameters

input int    BandsPeriod=20;       //平均周期

input int    BandsShift=0;         //指標位移

input double BandsDeviations=2.0;  //偏差數值

//---- buffers

double MovingBuffer[];

double UpperBuffer[];

double LowerBuffer[];

//+------------------------------------------------------------------+

//| Custom indicator initialization function                         |

//+------------------------------------------------------------------+

int init()

{

   SetIndexStyle(0,DRAW_LINE);

   SetIndexBuffer(0,MovingBuffer);

   SetIndexStyle(1,DRAW_LINE);

   SetIndexBuffer(1,UpperBuffer);

   SetIndexStyle(2,DRAW_LINE);

   SetIndexBuffer(2,LowerBuffer);

   SetIndexDrawBegin(0,BandsPeriod+BandsShift);

   SetIndexDrawBegin(1,BandsPeriod+BandsShift);

   SetIndexDrawBegin(2,BandsPeriod+BandsShift);

   return(0);

}

//+------------------------------------------------------------------+

//| Bollinger Bands                                                  |

//+------------------------------------------------------------------+

int start()

{

   int    i,k,counted_bars=IndicatorCounted();

   double deviation;

   double sum,oldval,newres;

   if(Bars<=BandsPeriod) 

      return(0);

//---- initial zero

   if(counted_bars<1)

      for(i=1;i<=BandsPeriod;i++)

      {

         MovingBuffer[Bars-i]=EMPTY_VALUE;

         UpperBuffer[Bars-i]=EMPTY_VALUE;

         LowerBuffer[Bars-i]=EMPTY_VALUE;

      }

   int limit=Bars-counted_bars;

   if(counted_bars>0) 

      limit++;

   for(i=0; i<limit; i++)

      MovingBuffer[i]=iMA(NULL,0,BandsPeriod,BandsShift,MODE_SMA,PRICE_CLOSE,i);

   i=Bars-BandsPeriod+1;

   if(counted_bars>BandsPeriod-1) 

      i=Bars-counted_bars-1;

   while(i>=0)

   {

      sum=0.0;

      k=i+BandsPeriod-1;

      oldval=MovingBuffer[i];

      while(k>=i)

      {

         newres=Close[k]-oldval;

         sum+=newres*newres;

         k--;

      }

      deviation=BandsDeviations*MathSqrt(sum/BandsPeriod);;

      UpperBuffer[i]=oldval+deviation;

      LowerBuffer[i]=oldval-deviation;

      i--;

   }

   return(0);

}

//+------------------------------------------------------------------+

[Xiangdong Guo]

andy662785:

#property strict

这一行告诉编译器严格执行语法检查。

所以如果编写代码时语法不严谨，就会出许多语法错误，导致编译失败。编译失败自然就不能用了。