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If you are asking if byte alignment still applies in a union, then the answer is yes
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If you are asking if byte alignment still applies in a union, then the answer is yes

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Have a look at the foll link<br />
<br />
<a href="http://www.pgroup.com/ppro_docs/pgiws_ug/pgiug_06.htm#Heading77" rel="ugc">http://www.pgroup.com/ppro_docs/pgiws_ug/pgiug_06.htm#Heading77</a><br />
<br />
Amit
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Have a look at the foll link

http://www.pgroup.com/ppro_docs/pgiws_ug/pgiug_06.htm#Heading77 [http://www.pgroup.com/ppro_docs/pgiws_ug/pgiug_06.htm#Heading77]

Amit

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Hi VivekGupta22,<br />
&gt;&nbsp;Is there any padding possible within a union<br />
<br />
Yes, you can add a &quot;dummy&quot; array:<br />
<br />
union my_union {<br />
&nbsp; int real_data_a;<br />
&nbsp; long double real_data_b;<br />
&nbsp; char dummy_padding[16];<br />
};<br />
<br />
This will make sure that the union is padded to 16 bytes, regardless of how long double is implemented on your machine (i.e., 80 bit on Intel, 128 on SPARC).<br />
<br />
<br />
Cheers, <br />
Stefan
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Hi VivekGupta22,
> Is there any padding possible within a union

Yes, you can add a "dummy" array:

union my_union {
  int real_data_a;
  long double real_data_b;
  char dummy_padding[16];
};

This will make sure that the union is padded to 16 bytes, regardless of how long double is implemented on your machine (i.e., 80 bit on Intel, 128 on SPARC).


Cheers,
Stefan

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Is there any padding possible within a union like there iare padding fields within a structure.
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Is there any padding possible within a union like there iare padding fields within a structure.

Is there any padding possible within a unon

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.