vBid not displaying correct

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Hi there,

I am new to this so would appreciate any help I can get. I have the following code to display the bid, ask and spread.

It is displaying the bid correctly except for a couple of pairs (CAD/CHF and NZD/JPY). I've done troubleshooting and digits is 5 for CAD/CHF so I am not sure why the bid is displaying  0.7008799999999999.


   int digits=(int)MarketInfo(symbolName,MODE_DIGITS);

   double vAsk=NormalizeDouble(MarketInfo(symbolName,MODE_ASK),digits);

   double vBid=NormalizeDouble(MarketInfo(symbolName,MODE_BID),digits);

   double vSpread=NormalizeDouble(MarketInfo(symbolName,MODE_SPREAD),digits);

   string tooltip=symbolName+"\n.: Price :.\nAsk: "+(string)vAsk+"\nBid: "+(string)vBid+"\nSpread: "+(string)vSpread;

   DrawLabel("price_"+symbolName,x,y,(string)vBid,fontSize,fontName,clrWhite,tooltip);


Appreciate your help in advance.


Thanks!


 
tim.ye: so I am not sure why the bid is displaying  0.7008799999999999.
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

  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
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