Questions from Beginners MQL5 MT5 MetaTrader 5 - page 965

[vladzeit]

Vladimir Karputov:

Better not to be confused and use one approach: either trade classCSymbolInfo or system functions like SymbolInfoXXXX.

Yes, thank you. Can I also clarify.

Can it lead to errors or is it just a recommendation for coding culture?

[Vladimir Karputov]

vladzeit:

Uh-huh, thank you. can I also clarify.

Can this lead to errors or is it just a recommendation for coding culture?

No one forbids to use vinaigrette, BUT: won't you confuse yourself with variable names over time, won't you remember whether you updated or didn't update data in the variable?

[vladzeit]

Vladimir Karputov:

No one forbids the use of a vinaigrette, BUT: won't you confuse yourself with variable names over time and remember whether or not you updated the data in the variable?

Thank you, I see)

[kopeyka2]

Vladimir Karputov:

If you need to compare several timeseries of the same timeframe, work with an array ofMqlRates type-> and useCopyRates to fill this array.

It is convenient to store time in aMqlDateTime structure -> useTimeToStruct to convert time fromdatetime toMqlDateTime structure.

Now your example 1 will look like this:

Thanks for the illustrative answers. But there are questions...

1. What does ? and : Found only :: context.

int count=(InpBarTime<10)?10:InpBarTime+1;

2. Which entry element defines the [h] entry in MT4

//--- example 1
// if(Period()<=PERIOD_H4 && TimeHour(Time[h])==0 && TimeMinute(Time[h])==0)
   MqlDateTime SDateTime;
   TimeToStruct(rates[InpBarTime].time,SDateTime); // Converts a value of datetime type into a structure variable MqlDateTime
   if(Period()<=PERIOD_H4 && SDateTime.hour==0 && SDateTime.min==0)
     {

     }
  

[Vladimir Karputov]

kopeyka2:

Thanks for the illustrative answers. But there are questions...

1. What does it mean ? and : Found only :: context

int count=(InpBarTime<10)?10:InpBarTime+1;

-->

This is an abbreviated form. All the same:

int count=0;
if(InpBarTime<10)
   count=10;
else
   count=InpBarTime+1;

2. Which entry element defines the [h] entry in MT4

//--- example 1
// if(Period()<=PERIOD_H4 && TimeHour(Time[h])==0 && TimeMinute(Time[h])==0)
   MqlDateTime SDateTime;
   TimeToStruct(rates[InpBarTime].time,SDateTime); // Converts a value of datetime type into a structure variable MqlDateTime
   if(Period()<=PERIOD_H4 && SDateTime.hour==0 && SDateTime.min==0)
     {

     }

-->

I think InpBarTime. What do you think?

[Fast235]

What do you mean ? and : Found only :: context

int count=(InpBarTime<10)?10:InpBarTime+1;

https://www.mql5.com/ru/docs/basis/operators/ternary

this operator has become fashionable lately, it is being used more and more often

[kopeyka2]

Vladimir Karputov:
kopeyka2:

Thanks for the illustrative answers. But there are questions...

1. What does it mean ? and : Found only :: context

-->

This is an abbreviated form. All the same:

2. Which entry element defines the [h] entry in MT4

-->

I think InpBarTime. What do you think?

I hardly think at the moment, in the usual sense of that state.... I'm BLONDING with a jack in the hand)))

You have globally declaredInpBarTime=3; And in MT4 [h] is from here to there usually in a loop (for limit ......)

#property script_show_inputs
//--- input parameters
int InpBarTime=3; // Bar where we compare the time
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()

Found the Market_Sessions Indicator There's an interesting design there.... Trying to get the rest of the internal dialogue in my head into it...))))

[Vladimir Karputov]

kopeyka2:

I'm hardly thinking now, in the usual sense of the term.... I'm blonde with a jack in the hand)))

And you wrote globally like this

Found the Market_Sessions Indicator There's an interesting construction there.... Trying to get the rest of the internal dialogue in my head into it...))))

Ah, sorry, should have written it that way:

//--- input parameters
input int InpBarTime=3; // Bar where we compare the time

[kopeyka2]

Fast528:

What do you mean ? and : Found only :: context

https://www.mql5.com/ru/docs/basis/operators/ternary

this operator has become fashionable lately, more and more often used

OK !!!

Did I get it right ?

//if(Period()<=PERIOD_H4 && TimeHour(Time[h])==0 && TimeMinute(Time[h])==0)
   MqlDateTime SDateTime;
   TimeToStruct(rates[InpBarTime].time,SDateTime); // Converts a value of datetime type into a structure variable MqlDateTime
   if(Period()<=PERIOD_H4 && SDateTime.hour==0 && SDateTime.min==0)
     {

     }
// А ЕСЛИ ПО ЦИКЛУ ?
int InpBarTime=10;
for(int a=0; a<=InpBarTime; a++) 
 {
//if(Period()<=PERIOD_H4 && TimeHour(Time[h])==0 && TimeMinute(Time[h])==0)
   MqlDateTime SDateTime;
   TimeToStruct(rates[InpBarTime].time,SDateTime); // Converts a value of datetime type into a structure variable MqlDateTime
   if(Period()<=PERIOD_H4 && SDateTime.hour==0 && SDateTime.min==0)
     {

     }
Запустив InpBarTime по циклу будем иметь цикл, но в структуре. Правильно?

[Vladimir Karputov]

kopeyka2:

OK !!!

Did I get it right?

You haven't got it right. I gave you a working example. Run it. Forget the MQL4 style writing. Start studying the code and look at the help.