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Re: To use Perl like conditional assignment in C

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Uno wrote:
> 
> On 9/25/2011 5:44 AM, pete wrote:
> > Uno wrote:
> >>
> >> On 9/24/2011 4:48 AM, pete wrote:
> >>> Ya Shou wrote:
> >>>>
> >>>> Hello,
> >>>>
> >>>> I want to assign an uncertain value to a variable, this variable with
> >>>> values in the configuration file, reads the configuration file
> >>>> through a function to return to the read configuration value, if not
> >>>> configured or the value of non-compliance, will return 0 for failure,
> >>>> when this, I will to give it a default value assigned.
> >>>>
> >>>> However, I found it seem impossible to achieve this in C, but much
> >>>> easier to implement in Perl, see below:
> >>>>
> >>>> cfgval = loadConfig () || DEFAULT_VAL;
> >>>>
> >>>> In C '||' operator does not return the value of the expression which
> >>>> is true, but returns 1 or 0, so that I can not be used in a similar
> >>>> way. I considered a program in C is:
> >>>>
> >>>> cfgval = loadConfig ()? loadConfig (): DEFAULT_VAL;
> >>>>
> >>>> And however, this approach to involve a duplication of code, it is
> >>>> ugly, the other will call loadConfig function twice, inefficient and
> >>>> likely to cause unnecessary accidents.
> >>>>
> >>>> Of course, if / else statement can achieve this functionality, but
> >>>> this method requires an additional variable, and not look simple. As
> >>>> follows:
> >>>>
> >>>> int loadval = loadConfig ();
> >>>> if (loadval! = 0) {
> >>>>      cfgval = loadval;
> >>>> } else {
> >>>>      cfgval = DEFAULT_VAL;
> >>>> }
> >>>>
> >>>> Or
> >>>>
> >>>> int loadval;
> >>>> cfgval = (loadval! = 0)? loadval: DEFAULT_VAL;
> >>>>
> >>>> I would like to ask you is, in this case, there is nothing more
> >>>> beautiful realization?
> >>>
> >>>       cfgval = loadConfig ();
> >>>       if (cfgval == 0) {
> >>>           cfgval = DEFAULT_VAL;
> >>>       }
> >>>
> >>
> >> pete,
> >>
> >> you just posted another syntax other than c tonight in clc; watch it,
> >> there, revolutionary.
> >
> > I don't think that I did that.
> >
> 
> Because perl is a child of c,
> or that if you thought what you posted was
> C, it wouldn't be syntactical?

I just posted some C code.
If it also happens to be some other code,
I don't know anything about it.

-- 
pete

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Thread

To use Perl like conditional assignment in C Ya Shou <shouyatf@gmail.com> - 2011-09-24 04:06 -0700
  Re: To use Perl like conditional assignment in C Willem <willem@toad.stack.nl> - 2011-09-24 11:13 +0000
  Re: To use Perl like conditional assignment in C pete <pfiland@mindspring.com> - 2011-09-24 07:48 -0400
    Re: To use Perl like conditional assignment in C Uno <merrilljensen@q.com> - 2011-09-24 21:58 -0700
      Re: To use Perl like conditional assignment in C pete <pfiland@mindspring.com> - 2011-09-25 08:44 -0400
        Re: To use Perl like conditional assignment in C Uno <merrilljensen@q.com> - 2011-09-26 21:52 -0700
          Re: To use Perl like conditional assignment in C pete <pfiland@mindspring.com> - 2011-09-27 21:14 -0400
            Re: To use Perl like conditional assignment in C Keith Thompson <kst-u@mib.org> - 2011-09-27 19:56 -0700
      Re: To use Perl like conditional assignment in C Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-09-25 06:53 -0700
      Re: To use Perl like conditional assignment in C "J. J. Farrell" <jjf@bcs.org.uk> - 2011-09-26 04:40 +0100
  Re: To use Perl like conditional assignment in C Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-24 09:04 -0400
    Re: To use Perl like conditional assignment in C Willem <willem@toad.stack.nl> - 2011-09-24 14:06 +0000
    Re: To use Perl like conditional assignment in C Ya Shou <shouyatf@gmail.com> - 2011-09-26 21:10 -0700
    Re: To use Perl like conditional assignment in C Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-09-29 22:08 +0000
  Re: To use Perl like conditional assignment in C "BartC" <bc@freeuk.com> - 2011-09-26 01:37 +0100

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