pragma pack structure in vxworks

Hi,

I am facing a problem in vxWorks. The problem is:

I hava a pragma packed structure like below:

struct C
{ float aaa;
float bbb;
} __attribute__((__packed__)) var3;

struct B
{

float aa;
float bb;
char cc;
struct C varC[10];
} __attribute__((__packed__)) var2;

struct A
{

float a;
float b;
char c;
struct B varB;
} __attribute__((__packed__)) var1;

The main function looks like below:

int try()
{

struct A varA;

printf("\n sizeof(A)=%d",sizeof(struct A));
printf("\n sizeof(B)=%d",sizeof(struct B));
printf("\n sizeof(C)=%d",sizeof(struct C));

return 1;
}

Then, the output is:

sizeof(A)=98
sizeof(B)=89
sizeof(C)=8

So, the output comes correctly as the structure A,B and C are all pragma packed.

But the problem is coming when I am trying to assign some floating point value to the variable 'aa' and 'bb' of structure B.

So the modified main function looks like this:

int try()
{

struct A varA;

printf("\n sizeof(A)=%d",sizeof(struct A));
printf("\n sizeof(B)=%d",sizeof(struct B));
printf("\n sizeof(C)=%d",sizeof(struct C));

varA.a=1.0; /* works fine */
varA.b=2.0; /* works fine */
varA.c='A'; /* works fine */

varA.varB.aa=10.0; /* problem : gives alignment exception */
varA.varB.bb=20.0; /* problem : gives alignment exception */
varA.varB.cc='B'; /* works fine */

return 1;
}

Now, if I change the data type of 'aa' and 'bb' to int...then it works fine.

plz help.