Metatrader 5 sample EAs very short?!

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Hi guys,

Just wondering about the sample EAs in the metatrader 5 platform.  Why are their codes very short?  Like for example ExpertCrossMA's code, it contains only a few lines of code while the sample codes in the articles are so long and detailed? What does these two lines mean:    

      if(!ExtExpert.InitSignal(new CSignalCrossMA)) return(-2);

      if(!ExtExpert.InitMoney(new CMoneyFixedLot))  return(-3);

    

Can someone kindly explain it to me?  I'm just a beginner programmer and I'm trying to study sample codes as my reference.

Thanks in advance!

 
The code of EA itself is short, but check all the include files referenced in the code. 
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