Hi, im trying to find a way around the problem of floating point numbers when trying to use it as a stoploss
In the following :
double cAsk = MarketInfo(_Symbol,MODE_ASK);
Sometimes cAsk becomes a floating point number EG 0.8626200000000001
Im having real trouble trying to use this number as a stoploss value and is giving me error 130
When i use NormalizeDouble() as follows it doesnt work
double cBid = MarketInfo(_Symbol,MODE_BID);
I then try to turn the double to string
string newBidStr = DoubleToStr(cBid,_Digits);
double newBidDb = StrToDouble(newBidStr);
This works as a string but how can i use a string as a double?
When i change it back to double it sometimes goes back to a long floating point number EG 0.8626200000000001
I do say sometimes. Not always sometimes it works sometimes its still a problem?
Not sure what to do?
Any help please
Floating point has a 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
Print out your values to the precision you want with DoubleToString - Conversion Functions - MQL4 Reference.
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) 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
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 or Bid/Ask: (No Need) to use NormalizeDouble in OrderSend - MQL4 programming forum
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.
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
double cAsk = NormalizeDouble( MarketInfo(_Symbol,MODE_ASK), (int)MarketInfo(_Symbol,MODE_DIGITS));
Wrong. #2.2 and #2.7
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