Bollinger buy-sell

// Youtube--> https://www.youtube.com/watch?v=CTp8O5h1AaU

#include<Trade\Trade.mqh>
CTrade trade;

int BandasdeBollinger=0;

int OnInit()
   {
   BandasdeBollinger=iBands(_Symbol,PERIOD_CURRENT,14,0,2,PRICE_CLOSE);
   return(0);
   }

void OnTick()
  {
   if(PositionsTotal() <= 10)
      {
       if(IndicadorBandas(2) > SymbolInfoDouble(NULL,SYMBOL_ASK)) trade.Buy(0.1);
       if(IndicadorBandas(1) < SymbolInfoDouble(NULL,SYMBOL_ASK)) trade.Sell(0.1);
      }
  }

double IndicadorBandas(int Buffer)
   {
    double BandasArray[];
    ArraySetAsSeries(BandasArray,true);
    CopyBuffer(BandasdeBollinger,Buffer,0,2,BandasArray);

    return(NormalizeDouble(BandasArray[1],_Digits));
   }