Please help me with EMA calculation - page 2

[nadiawicket]

//+------------------------------------------------------------------+
//|                                                          EMA.mq4 |
//|                        Copyright 2018, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2018, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
double ema()
  {
   double pr=2.0/(MA_Period+1);
   int    pos=Bars-2;
   if(ExtCountedBars>2) pos=Bars-ExtCountedBars-1;
//---- main calculation loop
   while(pos>=0)
     {
      if(pos==Bars-2) ExtMapBuffer[pos+1]=Close[pos+1];
      ExtMapBuffer[pos]=Close[pos]*pr+ExtMapBuffer[pos+1]*(1-pr);
      pos--;
     }
     return(ExtMapBuffer[pos]);
  }

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
double MA_Period;
int ExtCountedBars;
double ExtMapBuffer[];
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
//---
   ExtCountedBars=IndicatorCounted();
   ArrayResize(ExtMapBuffer,Bars-2);
   SetIndexBuffer(0,ExtMapBuffer);
   MA_Period=12;
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//---

  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//---


   Print(ExtMapBuffer[0]);
//
  }
//+------------------------------------------------------------------+

Any way to turn the ema() function into a double one and just have it return the values? Have a lot to go here.