MQL5: [4] Dunnigan, setas e if

for(int i=1; i<rates_total;i++)
  {
   if(low[i]<low[i-1] && high[i]<high[i-1])
     {
      VendaBuffer[i]=high[i];
     }
   else
     {
      VendaBuffer[i]=0;
     }

   if(low[i]>low[i-1] && high[i]>high[i-1])
     {
      CompraBuffer[i]=low[i];
     }
   else
     {
      CompraBuffer[i]=0;
     }
  }

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_plots   2

#property indicator_label1  "Venda"
#property indicator_type1   DRAW_ARROW
#property indicator_color1  clrRed
#property indicator_style1  STYLE_SOLID
#property indicator_width1  3

#property indicator_label2  "Compra"
#property indicator_type2   DRAW_ARROW
#property indicator_color2  clrDodgerBlue
#property indicator_style2  STYLE_SOLID
#property indicator_width2  3

double         VendaBuffer[];
double         CompraBuffer[];


int OnInit()
  {
   SetIndexBuffer(0,VendaBuffer,INDICATOR_DATA);
   SetIndexBuffer(1,CompraBuffer,INDICATOR_DATA);

   PlotIndexSetInteger(0,PLOT_ARROW,230);
   PlotIndexSetInteger(1,PLOT_ARROW,228);

   return(INIT_SUCCEEDED);
  }

int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
   for(int i=1; i<rates_total;i++)
     {
      if(low[i]<low[i-1] && high[i]<high[i-1])
        {
         VendaBuffer[i]=high[i];
        }
      else
        {
         VendaBuffer[i]=0;
        }

      if(low[i]>low[i-1] && high[i]>high[i-1])
        {
         CompraBuffer[i]=low[i];
        }
      else
        {
         CompraBuffer[i]=0;
        }
     }

   return(rates_total);
  }