Get the number of decimal places of any numbers (not just quotes) bypassing Digits() in MQL4 and MQL5 - page 4

[A100]

void OnStart()
{
        double price =  500000000.0001;
        Print( price, ":", d( price ));
}

Result: 500000000.0001:4

4, but not 8

[Алексей Тарабанов]

All righty then... Bathe in this joy, if you like it.

[fxsaber]

A100:

You guessed it. And how many decimal places are there? 8?

I don't need to be tested.

  Print(NormalizeDouble(1234567890 + 1 e-7, 8) == 1234567890); // true
  Print(1234567890 + 1 e-7 == 1234567890); // true

[A100]

fxsaber:

I don't need to be checked.

Nevertheless, you have corrected your code - so the check was helpful

[Алексей Тарабанов]

Print ( 12345+1e-7)

[fxsaber]

A100:

Nevertheless, you corrected your code

Look at where the code was pulled from. And for what practical purpose it was intended. If it is not clear - for prices.

There was no foolproofing in the code because it was not intended to be used by such a user.

In the course of the discussion, it turned out that foolproofing must be implemented if the code is published. Otherwise it will be 5 pages of shit.

So, indeed, corrected. Once again, numbers with infinite Digits is the norm.

[fxsaber]

Dmitry Fedoseev:

I know how NormalizeDouble works, because I've played its full analogue.

It all depends a lot on what Digits you want to get. If double-representation, your code gives a different value. If digits of a numeric constant, it is correct (and not always).

[Алексей Тарабанов]

Here we go again with the droppers...

[A100]

fxsaber:

It all depends a lot on what you need to get.

You need one

int f( double );

so that (in particular)

void OnStart()
{
        Print( f( NormalizeDouble( 500000000.0001, 4 )));
}

result is equal to: 4

[fxsaber]

A100:

You need one

to

The result was: 4

Perhaps that is exactly the function you need. Answered the TS.

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How to get the decimal places of any numbers (not only quotes) bypassing Digits() in MQL4 and MQL5

Alexandr Sokolov, 2018.11.03 17:39

I think I'm not the only one who faced a rare situation when I needed to get the number of decimal places