MQL5: [3] Envelopes, variáveis, inputs e for

for(int i=periodos-1; i<rates_total; i++)
  {
   double media=0;

   for(int j=0; j<periodos; j++)
     {
      media=media+close[i-j]/periodos;
     }

   SuperiorBuffer[i]=media*(1+desvio/100);
   InferiorBuffer[i]=media*(1-desvio/100);
  }

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_plots   2

#property indicator_label1  "Superior"
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrBlue
#property indicator_style1  STYLE_SOLID
#property indicator_width1  3

#property indicator_label2  "Inferior"
#property indicator_type2   DRAW_LINE
#property indicator_color2  clrRed
#property indicator_style2  STYLE_SOLID
#property indicator_width2  3

double         SuperiorBuffer[];
double         InferiorBuffer[];

input int periodos=14;
input double desvio=0.1;


int OnInit()
  {
   SetIndexBuffer(0,SuperiorBuffer,INDICATOR_DATA);
   SetIndexBuffer(1,InferiorBuffer,INDICATOR_DATA);


   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=periodos-1; i<rates_total; i++)
     {
      double media=0;

      for(int j=0; j<periodos; j++)
        {
         media=media+close[i-j]/periodos;
        }

      SuperiorBuffer[i]=media*(1+desvio/100);
      InferiorBuffer[i]=media*(1-desvio/100);
     }

   return(rates_total);
  }