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Re: What's wrong with "char op[8]=(istest?"ef":"df");"

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Mateusz Viste <mateusz@xyz.invalid> wrote:
> 2022-01-25 at 13:00 -0000, John Forkosh wrote:
>> Minimal working (or should I say non-working example)...
>> 
>> #include <stdio.h>
>> int main () {
>>   int istest=1;
>>   char op[8] = (istest?"ef":"df");
>>   /*char op[8] = "ef";*/
>>   printf("op=%s\n",op); }
>> 
>> for which cc emits the error...
>> 
>> test.c: In function 'main':
>> test.c:4:16: error: invalid initializer
>>     4 |   char op[8] = (istest?"ef":"df");
>>       |                ^
>> 
>> But if I comment out that line and uncomment the one below it,
>> then it compiles and runs fine. I've used this construction
>> a million times without problems. But a-million-and-one seems
>> to somehow be a problem. What's wrong???
> 
> I do not think that an array initializer can be a conditional
> expression.
>
> Are you sure that in your million previous times you were initializing
> an array, and not a pointer? ie. this should work as you expect:
> 
> #include <stdio.h>
> int main () {
>   int istest=1;
>   char *op = (istest?"ef":"df");
>   printf("op=%s\n",op);
> }
> 
> Mateusz

Thanks, Mateusz. Yeah, as you and Bart point out, my million previous
times must have been compliant with the standards. I'd of sworn I'd
done it exactly as originally illustrated, but I guess not.
-- 
John Forkosh  ( mailto:  j@f.com  where j=john and f=forkosh )

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What's wrong with "char op[8]=(istest?"ef":"df");" John Forkosh <forkosh@panix.com> - 2022-01-25 13:00 +0000
  Re: What's wrong with "char op[8]=(istest?"ef":"df");" John Forkosh <forkosh@panix.com> - 2022-01-25 13:09 +0000
    Re: What's wrong with "char op[8]=(istest?"ef":"df");" Bart <bc@freeuk.com> - 2022-01-25 14:03 +0000
      Re: What's wrong with "char op[8]=(istest?"ef":"df");" John Forkosh <forkosh@panix.com> - 2022-01-25 14:33 +0000
  Re: What's wrong with "char op[8]=(istest?"ef":"df");" Mateusz Viste <mateusz@xyz.invalid> - 2022-01-25 14:36 +0100
    Re: What's wrong with "char op[8]=(istest?"ef":"df");" John Forkosh <forkosh@panix.com> - 2022-01-25 14:41 +0000
  Re: What's wrong with "char op[8]=(istest?"ef":"df");" Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-01-25 06:39 -0800
    Re: What's wrong with "char op[8]=(istest?"ef":"df");" John Forkosh <forkosh@panix.com> - 2022-01-25 14:56 +0000
  Re: What's wrong with "char op[8]=(istest?"ef":"df");" James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-01-25 11:08 -0500
    Re: What's wrong with "char op[8]=(istest?"ef":"df");" John Forkosh <forkosh@panix.com> - 2022-01-26 08:18 +0000
  Re: What's wrong with "char op[8]=(istest?"ef":"df");" Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-01-25 14:37 -0800
    Re: What's wrong with "char op[8]=(istest?"ef":"df");" John Forkosh <forkosh@panix.com> - 2022-01-26 08:27 +0000
  Re: What's wrong with "char op[8]=(istest?"ef":"df");" Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-01-25 19:49 -0800
    Re: What's wrong with "char op[8]=(istest?"ef":"df");" Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-01-25 19:56 -0800
    Re: What's wrong with "char op[8]=(istest?"ef":"df");" James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-01-25 23:37 -0500
      Re: What's wrong with "char op[8]=(istest?"ef":"df");" Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-01-25 20:54 -0800
    Re: What's wrong with "char op[8]=(istest?"ef":"df");" John Forkosh <forkosh@panix.com> - 2022-01-26 08:37 +0000
  Re: What's wrong with "char op[8]=(istest?"ef":"df");" Kaz Kylheku <480-992-1380@kylheku.com> - 2022-01-26 05:08 +0000
    Re: What's wrong with "char op[8]=(istest?"ef":"df");" John Forkosh <forkosh@panix.com> - 2022-01-26 09:22 +0000
  Re: What's wrong with "char op[8]=(istest?"ef":"df");" John Forkosh <forkosh@panix.com> - 2022-01-26 09:24 +0000

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