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Re: To use Perl like conditional assignment in C

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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?
-- 
Uno

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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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