Programmers I'm stumped Help Me Please !!

Quoting amaruenterprise

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Hi to all the programmers. I am totally stumped . How do I get a number to round to the nearest tenth ?? I'm programming in MQL4. An example would be let say lotsize = (lot%/100) * accteqty ();
lotsize = lotsize / 1000;
lets say it comes out to be .14578 how would I get it to round to .2.
Any help you guys could give me would greatly be appreciated. I know it probably is something simple . Thanks in advance for the help...Valerie....

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Quoting McD

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Hello Valerie !

First of all, I'm NOT a MetaTrader-Programmer (I just
test it for about 2 weeks now), but your question is
kind of universal.
So, a short look in the "MetaQuote Language Editor"
showed under "Dictionary" (on the right side of the screen) and there under the topic "Math & Trig" the
entry for the function you are searching for:
it is called "MathRound()".

If you click on this topic,a short help will be displayed.

So,since I never programmed with MetaTrader I would
give the additional hint to try the following:

Since "MathRound" rounds to the nearest INTEGER you
would most probably first multiply by 10.
In your above mentioned example this would be:
.14578 *10 --> 1.4578
then call MathRound(1.4578) and the result would be
1.0 --> divide again by 10 --> 0.1

This means it would round DOWN to the nearest integer.
From there on you can easily adjust to your lot size.


BUT, if you want to always round UP to the next higher
Integer you would do additionally the following:
MathMod(.14578,.1)
If the result is >0 then there is a rest and you need to
add a .1 unit to the above result you received by using
MathRound().

Hope this helps, try a little ...

McD

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Quoting nvwine

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You can also try the NormalizeDouble() function see reference http://docs.mql4.com/convert/NormalizeDouble for info.

A couple of examples from Hendrick's Phoenix code:
lot=NormalizeDouble(AccountFreeMargin()*Risk/1000.0,1)
lot=NormalizeDouble(lot-lot*losses/DecreaseFactor,1)

Then you may need a line like this:
if(lot<0.1) lot=0.1

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