Number of digits in exponent with "g" format?   

Hello,

By default, the "g" format specifier seems to use 2 digits in the exponent 
if it decides to use the scientific format.  I.e., Double.ToString("g").  How 
do I control the number of exponent digits used without affecting the 
operation of "g" in any other way?  I need it to use 3 digits instead.

Thanks,
Ray

date: Thu, 17 Jul 2008 13:42:11 -0700   author:   Ray Mitchell

Re: Number of digits in exponent with "g" format?   

Ray Mitchell wrote:
> By default, the "g" format specifier seems to use 2 digits in the exponent 
> if it decides to use the scientific format.  I.e., Double.ToString("g").  How 
> do I control the number of exponent digits used without affecting the 
> operation of "g" in any other way?  I need it to use 3 digits instead.

Something like x.ToString("e") or x.ToString("0.00000000e+000") will
always use scientific format with 3 digits in the exponent.

Arne

date: Thu, 17 Jul 2008 20:57:38 -0400   author:   Arne Vajhøj

Re: Number of digits in exponent with "g" format?   

"Arne Vajhøj" wrote:

> Ray Mitchell wrote:
> > By default, the "g" format specifier seems to use 2 digits in the exponent 
> > if it decides to use the scientific format.  I.e., Double.ToString("g").  How 
> > do I control the number of exponent digits used without affecting the 
> > operation of "g" in any other way?  I need it to use 3 digits instead.
> 
> Something like x.ToString("e") or x.ToString("0.00000000e+000") will
> always use scientific format with 3 digits in the exponent.
> 
> Arne
> 

Yes, but I don't always want scientific.  I want it to be done like "g" does 
it except that when it does "choose" scientific, it uses 3 digits of exponent 
instead of 2.

date: Fri, 18 Jul 2008 00:19:00 -0700   author:   Ray Mitchell

Re: Number of digits in exponent with "g" format?   

Ray Mitchell wrote:
> "Arne Vajhøj" wrote:
>> Ray Mitchell wrote:
>>> By default, the "g" format specifier seems to use 2 digits in the exponent 
>>> if it decides to use the scientific format.  I.e., Double.ToString("g").  How 
>>> do I control the number of exponent digits used without affecting the 
>>> operation of "g" in any other way?  I need it to use 3 digits instead.
>> Something like x.ToString("e") or x.ToString("0.00000000e+000") will
>> always use scientific format with 3 digits in the exponent.
> 
> Yes, but I don't always want scientific.  I want it to be done like "g" does 
> it except that when it does "choose" scientific, it uses 3 digits of exponent 
> instead of 2.

Unfortunately there does not seem to be support for that in
.NET (NumberFormatInfo).

You will have to find the borders and write some code
that tests for inside/outside and call code accordingly.

Arne

date: Fri, 18 Jul 2008 21:44:50 -0400   author:   Arne Vajhøj