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Discussion of article "Writing an Expert Advisor using the MQL5 Object-Oriented Programming approach" - page 3

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VictorD:

Please help me to understand something I don't understand:

At the very beginning in the EA function is called:

doInit triggered (probably by default these variables are assigned NULL and 0). setPeriod and setSymbol should be before Init.
Snaf:
doInit is triggered (probably by default these variables are set to NULL and 0). setPeriod and setSymbol should be before Init.

I see, thanks

Amazing article!  I did not read entire thing yet, but already I can say that it is much much more helpful than 

anything I have seen thus far.  Thank you so very much :-)

 Spencer 

   if(base_currency=="USD")

     {

      one_lot_price=contract_size/levrage;

     }

   else

     {

      double bprice= SymbolInfoDouble(symbol,SYMBOL_BID);

      one_lot_price=bprice*contract_size/levrage;

     }


Marvelous thread. thank you very much.


There is some math mistakes.

assume the pair is cadchf?? 

also you assume constant leverage for all symbols. most brokers have different leverages for some pairs.

\any way the correct rule for any pair for the margin of 1 lots is Margin in account currenct is: C*Lots*YYYDDD

YYY is the base currency, DDD: Domination currency\

things will go fine with you until you reach CADCHF for example\

YYYDDD = CADUSD. --------------- not USDCAD is whown in the Marketwacth\\\


so you have to add third condition else-if

C=ContractSize/PairLeverage

very nice article.Thank you
translation error

forgot to insert this block.

//--- Other parameters
int STP,TKP;   // To be used for Stop Loss & Take Profit values
// Create an object of our class
MyExpert Cexpert;
Thanks. very helpful article. it helped me to introduce to EA developing very quickly.

Thanks @Samuel Olowoyo for this amazing article. Although this article is written 10 yrs back but it still hold ground for budding EA coders.

Are you still active on MQL5? I can only see 4 articles published by you (all published in 2010) 

Thank you , Thank you , Thank you. I had already written out the code for my EA without understanding the power of OOP, but rest assured it will be much cleaner after reading this. lol Very well done
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