Need Help with Simple Coding

//--define your function outside of OnTick()
int MyFunction(int a, int b){
   int result = a + b;
   return(result );
}
 
void OnTick(){
   int firstNumber = 5;
   int secondNumber = 10;
   
   //--call the function within OnTick()
   int MyAnswer = MyFunction( firstNumber, secondNumber);
   Print(MyAnswer);
}

Quoting One day!

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Why would you call OnTick(); from within OnTimer()?.. OnTick is called by the NewTick event, which is dealt with by the terminal. So every time a tick is received by the terminal, OnTick() will be called and all code within it processed. You can define your functions outside of OnTick() and just call them within OnTick().

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Quoting chimoong

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This script is to count the number of open BUY trades and open SELL trades, but it has a warning "return value of 'OrderSelect' should be checked", kindly advise, thank you.

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Quoting chimoong

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it is advisable to code the EA in OnTimer() rather than OnTick() basis. Honestly, I have no idea whether his advice is correct.

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Quoting chimoong

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For OnTimer function, I will study it later. From my understanding (kindly correct me if I'm wrong), we may put all the functions in OnTick() block and just put a simple code as follows, the EA will switch from OnTick() to OnTimer() :- void OnTick() { bla bla bla ... } void OnTimer() { OnTick(); }

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Quoting rockit

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{quote} In order to work with an order you first have to select it; this might succeed or fail; the function (any such function) will tell you if it succeeded or not (return true or false, respectively). Therefore you should check that. All of this is written in the docs however; read it very carefully.

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Quoting rockit

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{quote}Or use a script. Yes, it is that not all instruments are always traded ('tick') at the same time. So you need an independent means of handling.

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Quoting Beerrun

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{quote} No this is incorrect. When your terminal receives a new tick, start() (or OnTick()) is called. OnTimer() is called by the event timer at an interval you set using EventSetTimer()/EventSetMillisecondTimer(). The two functions are “event handlers” and do not call each other. The mt4 terminal does not know automatically which to use, you must tell it which event handler to use. It will not automatically switch between them without code telling it to use one or the other. You can use them separately or in the same program but you must include...

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Quoting chimoong

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{quote} Hi Rockit, my focus is yet on EA rather than on script as a script is only an one-time execution (but it is good to use a script for my testing and for my understanding) but EA is an ongoing mission for my trading activities.

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void OnStart()
{
    while(!IsStopped()) // loop until stopped by user
    {
            RefreshRates();
            /*
                    do something
            */
            Sleep(milliseconds); // i.e. 100; yield to system
    }
}

Quoting rockit

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{quote} A script can exit if and when you want it. Like so: ... This comes handy if you need handle things that are independent of a particular chart. Basically the same as using ontimer in an ea. A matter of preference.

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Quoting chimoong

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{quote} Thanks Rockit, at my coding knowledge level at this moment as a newbie, honestly, I don't really understand your script codes. Anyway, I'll keep it, whenever my coding skills are improved, by the time I should be able to understand. Thank you again.

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//using for()
int start(){
  for(int i=0;i<11;i++)Print(“i=“+(string)i);
  return 0;}
 
//or using while()
int start(){
  int i=0;
  while(i<11){
   Print(“i=“+(string)i);
   i++;}
  return 0;}

//using for()
int start(){
  for(int i=0;i>-1;i++)Print(“i=“+(string)i);
  return 0;}
 
//or using while()
int start(){
  int i=0;
  while(i>-1){
   Print(“i=“+(string)i);
   i++;}
  return 0;}
 
//or more simply
//for()
int start(){
  for(;;){
   //do something
   }
  return 0;}
 
//while()
int start(){
  while(){
   //do something
   }
  return 0;}

Quoting clemmo17

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Is there something like a shell for C programmers to test out code snippets the way there is for Python? I've tried using repl.it and it kinda works, but you can't just type in single lines and have it immediately spit out output the way you can with Python and IDLE for ex. If I wanted to test out your examples I'd have to figure out how to include them in a whole program to see what they do.

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Quoting clemmo17

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Is MetaEditor your main tool for MQ4 projects?

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Quoting clemmo17

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Is MetaEditor your main tool for MQ4 projects?

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Quoting Beerrun

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{quote} While() is a loop, everything in the following {} is repeatedly iterated as long as the condition inside () is true. So to make a script stay on the chart, you wrap all your start() code in an infinite loop and never break the loop. As scripts these will unload themselves when i=11 and the loop breaks:

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Quoting Segama

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{quote} I sometimes read&write mql code in SourceInSight as mql is very similar to cpp. It's a c/cpp programming editor, good keywords highlight, easy to search and navigate between functions and files, one hot key to format code. However, only metaeditor can compile mql code. {image}

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Quoting chimoong

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Can anyone show me the codes to compute (because I have no clue how to work on it) :- Last month's account balance (so that I can work on the (current balance - last month's account balance) / last month's account balance X 100 = performance (in %) of the current month)) Thanks

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int month_current = TimeMonth(TimeCurrent());
double balance_prev = AccountBalance();
for(int i = OrdersHistoryTotal() - 1; i >= 0; i--)
{    
    if(OrderSelect(i, SELECT_BY_POS, MODE_HISTORY) == false)
    {
        Print("Access to history failed with error (",GetLastError(),")");
        break;
    }
    if(TimeMonth(OrderCloseTime()) == month_current)
    {
        balance_prev -= OrderProfit() + OrderCommission() +  OrderSwap();
    }
    else
    {
        Print("balance at the end of last month = ", balance_prev);
        break;
    }
}