RE: [ROOT] How can I choose the accuracy of numbers ?

From: Valeri Fine (fine@bnl.gov)
Date: Wed May 26 2004 - 19:32:27 MEST 

See (for example or any other C/C++ book Web site ) 

http://www.lysator.liu.se/c/bwk-tutor.html#simple-io
"  . . . 
printf will format floating point numbers: ``%w.df'' in the format
string will print the corresponding variable in a field w digits wide,
with d decimal places.  An e instead of an f will produce exponential
notation. 
 . . . "

----
Best regards
                   Valeri


> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch] On
> Behalf Of Luis March Ruiz
> Sent: Wednesday, May 26, 2004 1:07 PM
> To: roottalk@pcroot.cern.ch
> Subject: [ROOT] How can I choose the accuracy of numbers ?
> 
> 
>   Dear ROOT users,
> 
>   I copy some results to a txt file (it goes OK),
> 
>   fprintf(foutput," %s    %g     %g      %g       %g      %g \n",
> histo,p0[i],e0[i],Chi2_offset,Chi_2/(n_bin*1.0-1.0),Kolmog_comp[i]);
> 
>   All these numbers are declared as Double_t.
> 
>   my problem is:
> 
>   How can I choose the accuracy of numbers ?
> 
>   I would like to put them in columns with the same width (i.e. with
the
> same number of digits for all numbers).
> 
>   I have been looking for SetPrecision or something like that, but I
> didn't find nothing (only TGNumberFormat, but there isn't any
example).
> 
>   I apologize for any inconvenience.
> 
>   Thanks.
> 
>   Best regards,
> 
>                                                     Luis

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