Incorrect rounding from the NormalizeDouble function.

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Quick question,

My `NormalizeDouble()` function is rounding prices to an incorrect number of digits.

I have a five digits broker and because the `NormalizeDouble` function is rounding prices to an incorrect accuracy, the TP and SL are out of whack.

I have the following code:

double price   =  NormalizeDouble(Bid,Digits);
  
   PrintFormat("The stop loss is %f",price);

The result is:

2023.10.30 12:05:17.507 experimental AUDUSD,H1: The stop loss is 0.637210

The terminal is rounding to 6 decimal places on a 5 decimal place broker.

Why is this?

 
TheHonestPrussian:

Quick question,

My `NormalizeDouble()` function is rounding prices to an incorrect number of digits.

I have a five digits broker and because the `NormalizeDouble` function is rounding prices to an incorrect accuracy, the TP and SL are out of whack.

I have the following code:

The result is:

The terminal is rounding to 6 decimal places on a 5 decimal place broker.

Why is this?

Check “ Digit” … see how many digits is showing … 
 
TheHonestPrussian: Why is this?

You used NormalizeDouble, It's use is usually wrong, as it is in your case.

  1. Floating point has an infinite number of decimals, it's you were not understanding floating point and that some numbers can't be represented exactly. (like 1/10.)
              Double-precision floating-point format - Wikipedia, the free encyclopedia

    See also The == operand. - MQL4 programming forum (2013)

  2. Print out your values to the precision you want with DoubleToString - Conversion Functions - MQL4 Reference.

  3. SL/TP (stops) need to be normalized to tick size (not Point) — code fails on non-currencies.
              On 5Digit Broker Stops are only allowed to be placed on full pip values. How to find out in mql? - MQL4 programming forum #10 (2011)

    And abide by the limits Requirements and Limitations in Making Trades - Appendixes - MQL4 Tutorial and that requires understanding floating point equality Can price != price ? - MQL4 programming forum (2012)

  4. Open price for pending orders need to be adjusted. On Currencies, Point == TickSize, so you will get the same answer, but it won't work on non-currencies. So do it right.
              Trailing Bar Entry EA - MQL4 programming forum (2013)
              Bid/Ask: (No Need) to use NormalizeDouble in OrderSend - MQL4 programming forum (2012)

  5. Lot size must also be adjusted to a multiple of LotStep and check against min and max. If that is not a power of 1/10 then NormalizeDouble is wrong. Do it right.
              (MT4 2013)) (MT5 2022))

  6. MathRound() and NormalizeDouble() are rounding in a different way. Make it explicit.
              MT4:NormalizeDouble - MQL5 programming forum (2017)
              How to Normalize - Expert Advisors and Automated Trading - MQL5 programming forum (2017)

  7. Prices you get from the terminal are already correct (normalized).

  8. PIP, Point, or Tick are all different in general.
              What is a TICK? - MQL4 programming forum (2014)

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