What happens when a position's size is Lots = 1/3?

Hi, I wonder if I open a position with a size of 1/3, will metatrader open it with 0.33, or 0.333 or anything else?
Thanks a lot!

I'm trying to figure out what your asking here.

If you are trying to follow a system and it indicates closing 1/3 of positions, you should be trading with multiple lots and close 1/3 of them.

I am sorry I did not make my question clear. What I want to do is using
"double Lots=AccountBalance()/30000;" If my account balance is 10000, will the EA open the position with a size of 0.33 lot or 0.333 lot, or 0.3333 lot or anything else? Will I lose money (maybe tiny amount) because of this?

Thanks again!

Lots=NormalizeDouble(AccountEquity()*MaximumRisk/1000.0,1);

You need to use normalizedouble. Look it up in metaeditor, the 1 after the comma is the number of decimal places to use. Generally unless you are on a micro account you are stuck with one decimal place, but you can confirm this with your broker, you would end up with .3

Hi dogberry,

From MetaEditor create a new indicator (CTRL+N). Select all the text (CTRL+A) and paste the follwoing text (CTRL+V):

#property indicator_chart_window
int start()
{
Print("Increments allowed for lots: " + DoubleToStr(MarketInfo(Symbol(),MODE_LOTSTEP),2));
Print("Smallest allowed lot size: " + DoubleToStr(MarketInfo(Symbol(),MODE_MINLOT),2));
Print("Largest allowed lot size:" + DoubleToStr(MarketInfo(Symbol(),MODE_MAXLOT),2));
}

I cut the decimal to two as I have yet to see a broker that will go 0.001, 0.109, etc...

Place the indicator on any chart. It should print the information you need (gathered from your broker) in the Expert tab at the bottom of the Terminal Window (CTRL+T).

While you're at the MetaEditor do a search for 'Market info' while in the Search tab of the Navigator (CTRL+D) and there are a bunch of parameters that can be used to get info from your broker...

Regards,
lucidlamp