//+------------------------------------------------------------------+
//|                                          True Strength Index.mq5 |
//|                        Copyright 2009, MetaQuotes Software Corp. |
//|                                              http://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "2009, MetaQuotes Software Corp."
#property link      "http://www.mql5.com"
#property version   "1.00"
#property indicator_separate_window
#property indicator_buffers 1
#property indicator_plots   1
#property indicator_type1   DRAW_LINE
#property indicator_color1  Red

input int MAPeriod = 5;
input int MAShift = 0;
input int    TriggerCandle 	= 1;
input bool   EnableNativeAlerts = true;
input bool   EnableSoundAlerts  = true;
input bool   EnableEmailAlerts  = true;
input bool   EnablePushAlerts  = true;
input string AlertEmailSubject  = "";
input string AlertText  	= "";
input string SoundFileName	= "alert.wav";

datetime LastAlertTime = D'01.01.1970';
int LastAlertDirection = 0;

double ExtLineBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
void OnInit()
  {
   SetIndexBuffer(0, ExtLineBuffer, INDICATOR_DATA);
   PlotIndexSetInteger(0, PLOT_SHIFT, MAShift);
   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, MAPeriod - 1);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total, const int prev_calculated, const int begin, const double &price[])
  {
   if (rates_total < MAPeriod - 1)
    return(0);

   int first, bar, iii;
   double Sum, SMA;

   if (prev_calculated == 0)
    first = MAPeriod - 1 + begin;
   else first = prev_calculated - 1;

   for(bar = first; bar < rates_total; bar++)
    {
     Sum = 0.0;
     for(iii = 0; iii < MAPeriod; iii++)
      Sum += price[bar - iii];

     SMA = Sum / MAPeriod;
     SMA=SMA-price[bar];

     ExtLineBuffer[bar] = SMA;
        }
      }


    // Alert System generated



 if (((TriggerCandle > 0) && (time[rates_total - 1] > LastAlertTime)) || (TriggerCandle == 0))
{
	string Text;
	// Above Zero Alert
	if (((ExtLineBuffer[rates_total - 1 - TriggerCandle] > 0) && (ExtLineBuffer[rates_total - 2 - TriggerCandle] <= 0)) && ((TriggerCandle > 0) || ((TriggerCandle == 0) && (LastAlertDirection != 1))))
	{
		Text = AlertText + "ExtLineBuffer: " + Symbol() + " - " + EnumToString(Period()) + " - Above Zero.";
		if (EnableNativeAlerts) Alert(Text);
		if (EnableEmailAlerts) SendMail(AlertEmailSubject + "ExtLineBuffer Alert", Text);
		if (EnableSoundAlerts) PlaySound(SoundFileName);
		if (EnablePushAlerts) SendNotification(Text);
		LastAlertTime = time[rates_total - 1];
		LastAlertDirection = 1;
	}
	// Below Zero Alert
	if (((ExtLineBuffer[rates_total - 1 - TriggerCandle] < 0) && (ExtLineBuffer[rates_total - 2 - TriggerCandle] >= 0)) && ((TriggerCandle > 0) || ((TriggerCandle == 0) && (LastAlertDirection != -1))))
	{
		Text = AlertText + "ExtLineBuffer: " + Symbol() + " - " + EnumToString(Period()) + " - Below Zero.";
		if (EnableNativeAlerts) Alert(Text);
		if (EnableEmailAlerts) SendMail(AlertEmailSubject + "ExtLineBuffer", Text);
		if (EnableSoundAlerts) PlaySound(SoundFileName);
		if (EnablePushAlerts) SendNotification(Text);
		LastAlertTime = time[rates_total - 1];
		LastAlertDirection = -1;
	}



   return(rates_total);
}


---> 'if' - expressions are not allowed on a global scope Row 72 col 2 if (((TriggerCandle > 0) && (time[rates_total - 1] > LastAlertTime)) || (TriggerCandle == 0))
---> '}' - not all control paths return a value Row 65 col 7