How to loop through the bars to identify first moving average cross over.

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How to loop through the bars to identify first moving average cross over. Just the description is what I need I can code it. Am new to MQL
 

  1. Loop through each index until you find a cross.

    int i=1; for(;;++i){
   double aPrev = …(i+1), aCurr = …(i),
          bPrev = …(i+1), bCurr = …(i);
   bool   wasUp = aPrev > bPrev,
           isUp = aCurr > bCurr,
        isCross = isUp != wasUp;
   if(isCross) break;
}
Print("Last cross at "+i);

  2. Do you really want to find the last cross? More likely, you want to check for a cross on a new bar.

 
E-vibes:
Tnx dear. 
 
I copied only 3 data in my moving average buffer so is it possible to loop through more than what I copied in the buffer in my for loop block 
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