Compiler error?

1. Play video	Please edit your post. For large amounts of code, attach it.

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2. Don't use strings when you mean an enumeration. What happens if you accidentally write Trend="Down";? What happens if you use an enumeration and write Trend=Down;?
   

   enum trend { RANGE, UP, DOWN };
   trend Trend = ...;
   
   if (Trend == RANGE){
      A = 0;//(an processing example) 
   }else if (Trend == UP){
      OrderSend();//(an processing example) 
   }else if (Trend == DOWN){
     OrderClose();//(an processing example) 
   }

3. When the condition was (Trend == "UP"), OrderClose() will occur, too.

   When the condition was (Trend == "DOWN"), OrderSend() will occur, too.

   You code says UP OrderSend. DOWN OrderClose.
   

1. I'm sorry. I don't attach it.

2. Thank you for explanation of MQL5. I can't understand MQL5 yet so well. 

3. When "Trend == UP" OrderSend() should be occur. But phenomenon that OrderClose() was executed, too. It has occurred many times.

    When "Trend == DOWN" OrderClose() should be occur. But phenomenon that OrderSend() was executed, too. It has occurred many times.

So I understand now.

1. I posted for large amounts attach
   
2. I didn't mention anything about MT5
3. Not by your posted code. "code says UP OrderSend. DOWN OrderClose." Of course we can't see your Trend code so if you're processing bar zero opens and closes can occur many times in a candle.
   

seivm, MQL5 will not work with the MT4 trading platform.  If you are trying to write code for MT5, then that will work.  If you are trying to code for MT4 (which I think is the most likely given you are on the MQL4 forum), then you need to use the MQL4 language.  Since the metaeditor can process both MQL4 and MQL5, you need to make sure that you are editing and compiling from 4.

Thank you for letting me know.

1. I'm sorry.

2. Indeed. I seems don't know all of the MQL4.

3. "code says UP OrderSend. DOWN OrderClose." ⇒ Yes.

   if you're processing bar zero opens and closes can occur many times in a candle. ⇒ Yes indeed ! That was the phenomenon. Well, it was a bar 1. I spend about 4 days about the phenomenon. There was no logical mistake except abnormal if statement.

 

Tens of minutes after correction of the if statement, forex market was closed. I felt my EA become stable. I'm going to confirm if it is stable next week in a long enough time. I have attached just the displaying phenomenon. Thank you.

 

sievm: Tens of minutes after correction of the if statement, forex market was closed. I felt my EA become stable. I'm going to confirm if it is stable next week in a long enough time.	Tester is for testing.

I still have never used Forex Tester. Only exclusively forward testing. Thank you.

Welcome, and good luck with your program. :)

Thank you JD4. 

The phenomenon was reproduced on Monday. ^^;

The cause was not our compiler. :)