Bug setting value of a double variable

[Gedday Silva]

Hello good Morning!

double fibo = 78.6;

however when displaying this information in the chart

the result is 78.5999999999999...

Does anyone know why this bug happens, and how to solve it?

I want to display the information in the graph and in this format it gets in the way,

I tried using NormalizeDouble that didn't work either

thanks

[Vladimir Karputov]

1. Please insert the code correctly: when editing a message, press the button    and paste your code into the pop-up window. (The first time I corrected your message)

2. Explore the help: DoubleToString

[William Roeder]

Gedday Silva:

Bug setting value of a double variable

Hello good Morning!

double fibo = 78.6;

however when displaying this information in the chart

the result is 78.5999999999999...

Does anyone know why this bug happens, and how to solve it?

I want to display the information in the graph and in this format it gets in the way,

I tried using NormalizeDouble that didn't work either

1. Please post only in English on this forum. Use the automatic translation tool if needed. Use simple language structure when using mechanical translation. 2013.08.09

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

   1. Floating point has infinite number of decimals, it's your 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 2013.06.07

   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 metals. (On 5Digit Broker Stops are only allowed to be placed on full pip values. How to find out in mql? - MQL4 programming forum) 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

   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 Metals. So do it right: Trailing Bar Entry EA - MQL4 programming forum or Bid/Ask: (No Need) to use NormalizeDouble in OrderSend - MQL4 programming forum

   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.

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

   7. Prices you get from the terminal are already normalized.

   8. PIP, Point, or Tick are all different in general.
                What is a TICK? - MQL4 programming forum 2014.08.03