#### Negative Zero?

```Sometimes when I subtract a number from itself, I get a negative zero, rather
than a simple zero.  Why is this?
```
 0
Herbert1 (9)
4/3/2005 12:23:03 PM
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```probably a small diff somewhere in the 15 digits of the number

--
Don Guillett
SalesAid Software
donaldb@281.com
"Herbert" <Herbert@discussions.microsoft.com> wrote in message
news:9517F5D9-3A15-4A97-93E1-B442A948E3E0@microsoft.com...
> Sometimes when I subtract a number from itself, I get a negative zero,
rather
> than a simple zero.  Why is this?

```
 0
Don
4/3/2005 1:17:57 PM
```It means that your result is less than zero, but not within the precision
you are displaying. For example, if the result is -0.00000000142, and your
number format is two decimal places, you will see -0.00. Subtracting a
number from itself often results in something other than true zero because
computers convert to binary to do computations. Binary conversions are not
perfect when extended to 15 decimal places.

--
Regards,
Fred

"Herbert" <Herbert@discussions.microsoft.com> wrote in message
news:9517F5D9-3A15-4A97-93E1-B442A948E3E0@microsoft.com...
> Sometimes when I subtract a number from itself, I get a negative zero,
> rather
> than a simple zero.  Why is this?

```
 0
fredsmith99 (155)
4/3/2005 3:58:27 PM
```
"Fred Smith" wrote:

> It means that your result is less than zero, but not within the precision
> you are displaying. For example, if the result is -0.00000000142, and your
> number format is two decimal places, you will see -0.00. Subtracting a
> number from itself often results in something other than true zero because
> computers convert to binary to do computations. Binary conversions are not
> perfect when extended to 15 decimal places.
>
> --
> Regards,
> Fred
>
>
> "Herbert" <Herbert@discussions.microsoft.com> wrote in message
> news:9517F5D9-3A15-4A97-93E1-B442A948E3E0@microsoft.com...
> > Sometimes when I subtract a number from itself, I get a negative zero,
> > rather
> > than a simple zero.  Why is this?
>
> Fred:
grateful.

Best regards,
Herbert
>
```
 0
Herbert1 (9)
4/3/2005 6:17:03 PM

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