Just started learning how to program, very easy question

Wow thank you, MQL has it all :), but i'm still wondering why my code doesn't work, the simple logic behind it shoud make it work.

RaptorUK is rightly saying that iHighest() is an easy way to do what you want. However, it's worth looking at what your code is doing, and why it isn't working. If someone says to you that they're going to call out a list of 11 numbers and they want you to work out the highest one, then I'm sure that the method you would use is completely different to the code you have tried to write. You'd hear the first number, and make a note of it. If the second number was higher, then you'd drop the first number and compare all the remaining numbers against the second number, etc. Basically, you'd continually be remembering the highest number you'd heard so far, and comparing the latest number to it.

A simple version of that in code would go as follows - this is designed to be clear, not to be optimal:

double HighestSoFar = High[0];
for (int i = 1; i <= 10; i++) {
  if (High[i] > HighestSoFar) HighestSoFar = High[i];
}

What your code is doing is so completely different that I think you must have blinded yourself to the obvious by thinking "I am writing computer code!". Basically, if you look at what your code is doing, then it is always going to put High[10] into temp3. On the very last of the 121 passes round the loops, where h=10 and z=10, then the code is going is to be saying "is High[10] greater or equal to High[10] ?", and therefore it will put High[10] into temp3.

  for(h=0;h<=10;h++){
            for(z=0;z<=10;z++){
            if(High[h]>=High[z]) {
            temp3 = High[h]+0.00010;
            }
            }

}
Comment("Lot Size Buy " + temp3); // LotSizeSell());

1. double highest = 0; for(h=0; h<11; h++) if (highest < High[h]) highest = High[h];
   temp3 = highest+0.00010;
   Comment("Lot Size Buy " + temp3); // LotSizeSell());

   or

   int    iHighest = Highest(NULL, 0, 11, 0);
   double highest  = High[iHighest];
   temp3 = highest+0.00010;

   ---

2. string  PriceToStr(double p){ return( DoubleToStr(p, Digits) ); }
   :
   Comment("Lot Size Buy " + PriceToStr(temp3)); // LotSizeSell());
   

   ---

3. See also pips2dbl

Okay, i have a new error... can't figure what to do.

Print("blabla");
            if(NormalizeDouble(Ask,4)   ==   NormalizeDouble(OrderTakeProfit()-Value1*4,4))
     {
Print("123"); 
OrderModify(ticket,Ask,StopLossBuy()+Value1,Ask+Value1*4,0,Blue);
     }

Okay it prints Blabla, that means that the program works until now

Then It doesn't print 123 that means that the error is not in OrderModify

This means that the condition is false, the condition is theorically true

Comment(Hour(),"\n", DoubleToStr(Ask,4), "=", DoubleToStr((OrderTakeProfit()-Value1*4),4) );

I use this comment to show on my chart the value of Ask and the value of OrderTakeProfit()-Value1*4

As you can see in my comment the condition is true, but my

if

doesn't work.

I'm going crazy this is the last step necessary to finish my FIRST ea, my brain hurts from working too much.

You are on a 5 digit broker and just printing 4 digits in your comment . . . . . what if the values are 1.31560 and 1.31562 . . . they are not equal.

Use DoubleToStr()

It should work anyway because i'm rounding the numbers so 1.31560 becomes 1.3156 and 1.31562 becomes 1.3156 too

i did this because the ask price sometimes moves by 2 points instead of 1

anyway i tried what you suggested anyway and it doesn't work

if(DoubleToStr(Ask,4)==DoubleToStr(OrderTakeProfit()-Value1*4,4))

if(NormalizeDouble(Ask,4)   ==   NormalizeDouble(OrderTakeProfit()-Value1*4,4))

is not come true. What is it ??? Why not use Digits here

if(NormalizeDouble(Ask,Digits)   ==   NormalizeDouble(OrderTakeProfit()-Value1*4,Digits))

and why has it to be equal before you modify and not >= (buy) or <= (sell)

and maybe you could trie

if(Ask   >=   NormalizeDouble(OrderTakeProfit()-(Value1*4,Digits)))

or

if(Ask   >=  (OrderTakeProfit()-(NormalizeDouble(Value1*4,Digits))))

and did you select the open trades with a loop

so you select the right trade to modify...

I have tried >= it doesn't work anyway

i tried to use Digits, well it doesn't make a difference

i have tried to select the trade, it doesn't work anyway. But also i only trade 1 order at a time, so it can't be wrong anyway.