Re: sizeof a union

On 2005-11-29, pemo <usenetmeister@xxxxxxxxx> wrote:
>
> "Mockey Chen" <mockey.chen@xxxxxxxxxx> wrote in message
> news:dmhr15$9l8$1@xxxxxxxxxxxxxxxxx
>> My friend ask me a question as following:
>>
>> give a union SU define as:
>> typedef union _SU
>> {
>> short x;
>> struct y{
>> char a;
>> short b;
>> char c;
>> };
>> }SU;
>>
>> what is the sizeof (SU)?
>>
>> My compiler tell me the answer is 6.
>> I want to know why the answer is 6.
>
>
> Why not add another member and use that to 'explore' the other members,
> e.g.,:

[snipped]

Out of curiosity, why is it impossible to add a 'flexible array' to a
union? The best solution to this IMO would be an "unsigned char data[];"
member.
.

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