Use/return a integer value from a double array

[ReLor2]

Hi,

i try to understand the basic things in mql5

So at the moment i want to define a array, for that i do this

double my_double_array[]={"0","0","0"};

now i want to store and return some different kinds of datas

in the first element should a integer value 

my_double_array[0]=0; //only number, not double/float...

in the second a double value

my_double_array[1]=0.00;

At the moment all values returns "0.00" (= double).

I thought double arrays can store integer values too?

Have i do something more to get what i want?

Thanks to make it clear for me  ;-)

[Paul Anscombe]

ReLor2:
Hi,

i try to understand the basic things in mql5

So at the moment i want to define a array, for that i do this


now i want to store and return some different kinds of datas

in the first element should a integer value 

in the second a double value

At the moment all values returns "0.00" (= double).

I thought double arrays can store integer values too?

Have i do something more to get what i want?

Thanks to make it clear for me  ;-)

You can store whole numbers as doubles and typecast them to integers.  

You should set the size of the array

[Carl Schreiber]

See here: https://www.mql5.com/en/docs/basis/types/casting

[ReLor2]

Hello,

if I understand that correctly, is there no way to declare the memory space of the individual array elements as an "integer" type?

I need to specifically format the output of the array element instead? This would mean, however, that this formatting must take place always and everywhere, if the value is saved directly and correctly, this effort would not be necessary.

Isn't there such a possibility or did I misunderstand something? If in doubt, maybe someone can give me a short example of my code above, then it might explain it better? Thanks!

[Keith Watford]

ReLor2:
Hi,

i try to understand the basic things in mql5

So at the moment i want to define a array, for that i do this


now i want to store and return some different kinds of datas

in the first element should a integer value 

in the second a double value

Use a struct array.

Docs

[Carl Schreiber]

or a union?

[Tobias Johannes Zimmer]

double array[]={1.234, 45.67, 789.0};

for(int i=0; i<ArraySize(array) && !IsStopped; i++;)

Print((int)array[2]);

//Results: 

//1

//45

//789

That is the whole trick to it. But it comes in handy when working with global variables of the terminal. You can store meta information like

-indicator periods or 

-boolean 1(true) or 0(false) or

-enums cast to integers (MQ does this often)

-datetime cast to int format (seconds since january first 1970)

Also if you look at the volumes indicator: tick volume is long format, but the indicator buffer is double. Still works.

[Fernando Carreiro]

@Tobias Johannes Zimmer #:  That is the whole trick to it. But it comes in handy when working with global variables of the terminal. You can store meta information like ... Also if you look at the volumes indicator: tick volume is long format, but the indicator buffer is double. Still works.

You are a long time poster, but you still don't post code properly. Please do so with the "</>" icon or Alt-S.

[Tobias Johannes Zimmer]

Fernando Carreiro #:

You are a long time poster, but you still don't post code properly. Please do so with the "</>" icon or Alt-S.

You are right, it is better:

//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
  {
//---
   double array[] = {1.234, 45.67, 789.0};

   for(int i = 0; i < ArraySize(array) && !IsStopped(); i++)
      Print((int)array[i]);

//Results:
//1
//45
//789
  }

(Fixed some errors btw)

[ReLor2]

Keith Watford #:

Use a struct array.

Docs

i think this is my favorite way.

Is it possible to work with this in/for a function?

Can i give this array to a function, if is there a special way or only like above?

void my_function(my_struct_array)
{
//do i haveto return it or can I access of the proceesed values outside from the function to?

}

[Keith Watford]

ReLor2 #:

i think this is my favorite way.

Is it possible to work with this in/for a function?

Can i give this array to a function, if is there a special way or only like above?

void my_function(my_struct_array)
{
//do i haveto return it or can I access of the proceesed values outside from the function to?

}

You can pass it by reference.