Using a union as a function parameter

[Juke All]

When I compile the code (below), I get this error:
cannot convert parameter 1 from 'int' to 'union dna'

Without saying:

FOO x;
x.val = 100;

....is it possible to use a union as a function parameter, and when
calling that function, pass the argument as one of the types of the
union (int, in the following case)?
typedef union foo
{
void* ptr;
int val;
} FOO;

void* test(FOO obj)
{
void* ptr = obj.ptr;
int val = obj.val;
return NULL;
}

int main(int argc, char* argv[])
{
int x = 100;
test(x);
return 0;
}

[j]

"Eric Sosman" <Er*********@su n.com> wrote in message
news:40******** ****@sun.com...

Mark A. Odell wrote:

"Mark A. Odell" <od*******@hotm ail.com> wrote in
news:Xn******** *************** *********@130.1 33.1.4:

Juke All <[e-mail]> wrote in
news:tc****** *************** ***********@4ax .com:
>>void* test(FOO obj)
>>{
>> void* ptr = obj.ptr;
>> int val = obj.val;
>> return NULL;
>>}
>>
>>int main(int argc, char* argv[])
>>{
>> int x = 100;
>> test(x);
>
>What the ^*&^& are you thinking here? You told the compiler that
>test() takes a FOO as a parameter and then you give it a stinking int?
>What part of the compiler error isn't clear? Try declaring 'x' as type
>FOO and try again.

I know that works, hence, the part of my message where I said:

Without saying:
FOO x;
x.val = 100;

I was just wondering if it was possible to pass an int into something
that expects union foo (and one of the union members is an int).

Of course not! That's the whole point of a typed language. If you want
to save some typing you can initialize x at the point of definition like
this:

int main(void)
{
FOO x = { NULL, 100 };

eh-hem, I was thinking struct here. Ignore this post please. You can force the compiler to accept the int as a FOO via:

int x = 100;

test((FOO) x);

Umpire: "Steee-riiike two!"

Commentator: "Another bad swing at a pitch 'way outside
the strike zone! That's not the Odell we're used to; something
about this pitcher's dipsy-doodle side-arm delivery has got
him baffled. Let's hope he gets un-baffled -- he digs in,
looks out at the mound, here's the windup ..."

heh, this is gold. This has to be the most humorous post I have ever
read on c.l.c.
--
Er*********@sun .com

--
j