array of unions (c code)

alaios · 09-15-2005, 05:48 PM

Hi i have declared an array of unions like that
union qdisc qdisc_stats[10];

I am trying to access each element separately like that
qdisc_stats[0].htb.parameter (htb is a struct )

but this returns me the eroor

parse.c:126: error: subscripted value is neither array nor pointer

itsme86 · 09-15-2005, 05:58 PM

Can you show your union definition?

jlliagre · 09-15-2005, 06:09 PM

This works for me:

Code:

typedef struct htb
{
        char *parameter;
} htb;

union qdisc {
        int i;
        struct htb htb;
}
qdisc_stats[10];

main()
{
        qdisc_stats[0].htb.parameter="foo";
        printf("%s %d\n", qdisc_stats[0].htb.parameter, qdisc_stats[0].i);
}

alaios · 09-15-2005, 06:47 PM

Thx i have fixed it

Now i have something else

union qdisc qdisc_stats[10];

I want to pass the following union as a parameter to a function

void read_diff_parameters(struct diff_configuration *diff,union qdisc *qdisc){

the function is called
read_diff_parameters(&diff_configuration,&qdisc_stats);

this prints the following warning
3threads.c:47: warning: passing arg 2 of `read_diff_parameters' from incompatible pointer type

jlliagre · 09-15-2005, 07:12 PM

try &qdisc_stats[0]

paulsm4 · 09-16-2005, 11:10 AM

Whoops - I accidentally posted "reply" to the wrong thread.

The (related!) thread I meant to reply to is here:

http://www.linuxquestions.org/questi...hreadid=363900

jlliagre · 09-16-2005, 11:43 AM

Quote:

Please consider at least *borrowing* a copy of K&R from a library until I can get you a copy. Please?

well, you "unposted" just in time

I was about to answer to that ...