Re: Can someone explain why this code outputs 7 ? （Is this a gcc bug?)

[Prathamesh Kulkarni]

On 23 April 2016 at 17:06,  <chen@center.wakayama-u.ac.jp> wrote:
> The following code gives 7 when compiled with gcc.
>
> I think, the value of the three phase "++i" should be 1, 2, 3, although
> the order may be different. So, the sum of them should be 6.
>
>  I have confirmed that it gives 6 when compiled with clang.
>
> I know that a program having common sense  will not write code like this,
>  but I still can not understand this behavior of gcc.
>
> /******************************************/
> #include <stdio.h>
> int main()
>  {
>   int i = 0;
>   printf("%d\n", (++i) + (++i) + (++i));
>   return 0;
> }
Please see:
[1] https://gcc.gnu.org/bugs/#nonbugs
[2] http://c-faq.com/expr/seqpoints.html

Thanks,
Prathamesh
>
>