Requests & Ideas (MQL5 only!) - page 35

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Vladimir Karputov:

The variable name is a constant. The name of the variable is unchanged.


I found a clear use case example:

$Reno = 360000;
$Pasadena = 138000;
$cityname = "Reno";
echo "The size of $cityname is ${$cityname}";
$cityname = "Pasadena";
echo "The size of $cityname is ${$cityname}";
//The output from this code is

//The size of Reno is 360000
//The size of Pasadena is 138000

Will be my last attempt at explaining myself ;)

 
Vladimir Karputov:

And why do we need such an indicator? What is the idea of ​​using it?


so we can know how we perform on the current day, either win or lose on trading.

that's big effect on trader emotion.

 
forextime8 :

so we can know how we perform on the current day, either win or lose on trading.

that's big effect on trader emotion.


Where is the trading idea? What gives knowledge: today we are in profit or loss? How should this affect the trade of an adviser?

 

I would like to modify this Fractal indicator that I attached so that I could modify the number of bars on side that has by default, this indicator that has the code open and can be modified, the number that I would like is 15/15, thanks

 
eliot6 :

I would like to modify this Fractal indicator that I attached so that I could modify the  number of bars  on side that has by default, this indicator that has the code open and can be modified, the number that I would like is 15/15, thanks


Sorry, only MQL5 is discussed here. All questions on the old code you can solve in the service Freelance.

 

huuh ...does i read correct -> this works in MT5 ?


echo "The size of $cityname is ${$cityname}";


if yes it would be amazing ....mmmmh more complex programming ...i could eat that language

 

äähhmm i had a idea ... a nice c++ "try & catch" function would be a great feature :D

 
Christian Stern :

huuh ...does i read correct -> this works in MT5 ?



if yes it would be amazing ....mmmmh more complex programming ...i could eat that language


See the examples: PrintFormat

void OnStart()
  {
//--- trade server name
   string server=AccountInfoString(ACCOUNT_SERVER);
//--- account number
   int login=(int)AccountInfoInteger(ACCOUNT_LOGIN);
//--- long value output
   long leverage=AccountInfoInteger(ACCOUNT_LEVERAGE);
   PrintFormat("%s %d: leverage = 1:%I64d",
               server,login,leverage);
//--- account currency
   string currency=AccountInfoString(ACCOUNT_CURRENCY);
//--- double value output with 2 digits after the decimal point
   double equity=AccountInfoDouble(ACCOUNT_EQUITY);
   PrintFormat("%s %d: account equity = %.2f %s",
               server,login,equity,currency);
//--- double value output with mandatory output of the +/- sign
   double profit=AccountInfoDouble(ACCOUNT_PROFIT);
   PrintFormat("%s %d: current result for open positions = %+.2f %s",
               server,login,profit,currency);
//--- double value output with variable number of digits after the decimal point
   double point_value=SymbolInfoDouble(_Symbol,SYMBOL_POINT);
   string format_string=StringFormat("%%s: point value  = %%.%df",_Digits);
   PrintFormat(format_string,_Symbol,point_value);
//--- int value output
   int spread=(int)SymbolInfoInteger(_Symbol,SYMBOL_SPREAD);
   PrintFormat("%s: current spread in points = %d ",
               _Symbol,spread);
//--- double value output in the scientific (floating point) format with 17 meaningful digits after the decimal point
   PrintFormat("DBL_MAX = %.17e",DBL_MAX);
//--- double value output in the scientific (floating point) format with 17 meaningful digits after the decimal point
   PrintFormat("EMPTY_VALUE = %.17e",EMPTY_VALUE);
//--- output using PrintFormat() with default accuracy
   PrintFormat("PrintFormat(EMPTY_VALUE) = %e",EMPTY_VALUE);
//--- simple output using Print()
   Print("Print(EMPTY_VALUE) = ",EMPTY_VALUE);
/* execution result
   MetaQuotes-Demo 1889998: leverage = 1:100
   MetaQuotes-Demo 1889998: account equity = 22139.86 USD
   MetaQuotes-Demo 1889998: current result for open positions = +174.00 USD
   EURUSD: point value  = 0.00001
   EURUSD: current spread in points = 12 
   DBL_MAX = 1.79769313486231570e+308
   EMPTY_VALUE = 1.79769313486231570e+308
   PrintFormat(EMPTY_VALUE) = 1.797693e+308
   Print(EMPTY_VALUE) = 1.797693134862316e+308
*/
  }
 
Vladimir Karputov:

See the examples: PrintFormat

hey, no the point of using dynamic variables is, that i want call a list of classes and store them in a array. Now i use a construct of if conditions with hard coded class names. but i would be fancy to have a array of classnames and than call them such as:

$class = "foobar";

${ $class } myclass = new ${ $class }();


this is a very simple example without a loop and without a base class ( class interface )


i use this in perl to load modules for example. but i had this discussion in another thread and i guess it's not posible because the var names are static.

 
Christian Stern :

hey, no the point of using dynamic variables is, that i want call a list of classes and store them in a array. Now i use a construct of if conditions with hard coded class names. but i would be fancy to have a array of classnames and than call them such as:


this is a very simple example without a loop and without a base class ( class interface )


i use this in perl to load modules for example. but i had this discussion in another thread and i guess it's not posible because the var names are static.


That's right, in MQL5  the var names are static. 

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