NormalizeDouble() making me go crazy!! | Forex Factory

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NormalizeDouble() making me go crazy!!

  • #1
  • First Post: Aug 14, 2007 1:03am Aug 14, 2007 1:03am
So I cannot for the life of me to get this to work whatsoever.

ei: double test = NormalizeDouble(230.2,2);


Should return 230.20 I believe? it doesn't!!!

I've tried puting it every which way, using Digits as the for the second variable, using 2, using "2". nothing works!! It ALWAYS returns 230.2.

please HELP! i am losing my mind here.


I can even put (230.2,8) and it still returns 230.2

If I try (230.453543654654,2) it returns 230.4535 ?????????

I just dont get it!!!!!
  • #2
  • Aug 14, 2007 7:52pm Aug 14, 2007 7:52pm
Anyone?????

I've spent hours searching and trying to figure out what the hell is wrong.

The only way possible to get it to have 0's at the end is to convert it to a string, and i can't place and order with strings!!!
  • #3
  • Aug 14, 2007 9:13pm Aug 14, 2007 9:13pm
  •  tesla
  • Joined Oct 2006 | Status: Friendly Neighborhood Programmer | 533 Posts
NormalizeDouble doesn't control how the number is displayed, for that you want DoubleToStr.

NormalizeDouble is used to manage the problem inherent in storing non-integer values in bits. For example, a computer can't store the exact value of 0.1, it ends up being something like 0.10000000000021. NormalizeDouble allows you to take that value, round to desired precision (0.1) and make use of it.
  • #4
  • Aug 14, 2007 9:16pm Aug 14, 2007 9:16pm
hmm ok thanks, it seems i may be having a different issue.
  • #5
  • Aug 16, 2007 12:03pm Aug 16, 2007 12:03pm
Quoting tesla
NormalizeDouble doesn't control how the number is displayed, for that you want DoubleToStr.

NormalizeDouble is used to manage the problem inherent in storing non-integer values in bits. For example, a computer can't store the exact value of 0.1, it ends up being something like 0.10000000000021. NormalizeDouble allows you to take that value, round to desired precision (0.1) and make use of it.

Care to elaborate. I hate to think we are putting humans in space with a computer that can't count. ( I am not being smart, just curious)
  • #6
  • Aug 16, 2007 4:30pm Aug 16, 2007 4:30pm
  •  tesla
  • Joined Oct 2006 | Status: Friendly Neighborhood Programmer | 533 Posts
Here's a wikipedia entry that talks about the precision issue, I linked in-page to a description of the problem, scroll up and read to find out more background info.
  • #7
  • Last Post: Aug 17, 2007 11:51am Aug 17, 2007 11:51am
Quoting tesla
Here's a wikipedia entry that talks about the precision issue, I linked in-page to a description of the problem, scroll up and read to find out more background info.

Interesting reading, but over my head right now. Thanks
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