"A" is only the variable where we store value.

A = A + B; means that we want to modify the value stored in A ... with a new value (A+B).

Of course after executing that struction ... A will have new value.

i After B is not needed and would be an error.

I'll give you an example and I hope it will make it clearer:

You have in your pocket 10$ ok?

int your_pocket = 10;

Then I gave you 5$ ok?

int i_gave = 5;

You putted the 5$ which I gave to you in your pocket, How much in your pocket now and how to collect them?

your_pocket(now) = your_pocket(before I gave you the 5$) + i_gave (5$ which I gave them to you)

your_pcoket=your_pocket+i_gave; //which is 15$

You can write the above expression like this:

your_pocket+=i_gave; //which is 15$

So, the purpose of this operator is to increase your_pocket with the amount i_gave you and assign them again to your_pocket(or update your_pocket or put them back to your_pocket).

Is it clearer now?

Now, I want my 5$ back



Where did you come with the i? was it in the lesson? If yes it was a keyboard mistake and I'll update it.

A == B; means:
You asking MQL4 is A equal to B and MQL4 has to answer you with True or False (yes or no).

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I was looking for a place to learn Meta trader 4 language. Finally........................thanks a lot................thanks again.

You're Welcome!

I hope you enjoy them

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Hope it helps !
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Senior MQL programmer:
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Hi, I am new to this forum and am looking forward to reading your Metatrader lessons. However, I cant find lessons 1 and 2 (I am at the moment reading lesson 3)

Thanks

Mike

Mike,

To view all the lessons' threads, choose a long period (EX: Last year) in display options.

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It is arithmetical operations but it is logic.
In arithmetic if
A + B so it should be C already.
It should not be the same A (the same value).

Because if we are increasing A on B assigning the result to A so
A will be increasing on B all the time. Every second A will be increasing on B without any stopping. It means A plus B is equal A (the same A?) so plus B once again (because of A plus B) is equal A (an other A) which should be added to B and so on.

May be during the coding everything will be clear.

This is often very confusing for first time programmers. Note that the "=" and the "==" are used very differently. "=" is called the assignment operator because it causes the expression on the right hand side to be assigned to the variable on the left hand side. There is no infinite loop as you suggest.
The expression A=A+B; means:
take the current value of the variable A and add it to the current value of the variable B. Then place the result of the addition into variable A. So, after the expression is executed, the value of variable A will change.
For example, if A equaled 2 and B equaled 3 than after executing A=A+B (or the equivalent A+=B) A would have the value 5 assigned to it.



But I have a question.
In Relational operators A == Bi;
It means true if A equal B else false.

Is it necessary to have i after B?

I think you may have mistakent the semi-colon for an "i". You are correct in your definition of this logical expression except for the inclusion of the extra character "i" the relation A==B is true if A equals B and false otherwise.

I hope this helps.

Hi coders !!!
I am studying from very begin. I am testing every operator because of training Could you explain how "+-" operator works ? I tryed but it makes error in compiling. Could you give me a simple, sample code with that operator.

Thnx !

passass

Hi, Coders..
It would like to know as it would be the represented number below in the MT4.

0,000072

Thanks,
Ok!!! No have problems!!!!

Hi coders...

This expression is complex (MT4) for me. It could help me?

(b-d)<=((d-c)/5))

(b-a)<=((a-c)/5))


(d-c)<=((b-d)/5))

(a-c)<=((b-a)/5))

Thanks,