Newbie if statement qestion

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4	naz 2008.02.12 01:15 Hello, Can someone tell me why the following statement does not work? if(Bid == SellOpenPrice) For some reason it returns false most of the time when it is true. Thank you in advance

Review of Participants by Yuriy Zaytsev (YuraZ)

I am not surprised by the profit of the top ten.

2462

phy 2008.02.12 01:58

"Can someone tell me why the following statement does not work?"

Because they are not equal despite your protestations.

Comparing equality of doubles is a known problem because of the way doubles are represented in binary.

When you get stuck, you can change to something like:

if(MathAbs(Bid - SellOpenPrice) < .00001)

Or...

Rosh 2007.05.16 12:13

Use function from Stdlib.mq4

//+------------------------------------------------------------------+
//| right comparison of 2 doubles                                    |
//+------------------------------------------------------------------+
bool CompareDoubles(double number1,double number2)
  {
   if(NormalizeDouble(number1-number2,8)==0) return(true);
   else return(false);
  }

naz 2008.02.12 02:36

phy wrote:

"Can someone tell me why the following statement does not work?"

Because they are not equal despite your protestations.

Comparing equality of doubles is a known problem because of the way doubles are represented in binary.

When you get stuck, you can change to something like:

if(MathAbs(Bid - SellOpenPrice) < .00001)

Or...

Rosh 2007.05.16 12:13

Use function from Stdlib.mq4

//+------------------------------------------------------------------+
//| right comparison of 2 doubles                                    |
//+------------------------------------------------------------------+
bool CompareDoubles(double number1,double number2)
  {
   if(NormalizeDouble(number1-number2,8)==0) return(true);
   else return(false);
  }

Thanks Phy. I will give it try.

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Newbie if statement qestion