how to avoid "initializer element is not constant"

[huamama]

hi,

I want to initialize an array in my codes. When I tried to compiled
it, it shows "initializer element is not constant" error, but I tied
to use const variable, this error still remains.
Is there any way to use const variable to avoid this error?
my codes is below:

int a = 10;
static const int b = 20;
const int c = 20;

int p[] = {a, b, c};

int main()
{
printf("hello");
return 0;
}

Thanks!

[m_l_g3]

On Oct 20, 5:58 am, huamama <huam...@gmail.com> wrote:
> hi,
>
> I want to initialize an array in my codes. When I tried to compiled
> it, it shows "initializer element is not constant" error, but I tied
> to use const variable, this error still remains.
> Is there any way to use const variable to avoid this error?
> my codes is below:
>
> int a = 10;
> static const int b = 20;

#define b 20

[sh.v...@gmail.com]

In my opinion, when doing aggregate initialization, values have to be
compile time constant. i.e. constant strings like "hello world" or
numeral constants like 10,20 etc.
one probable reason I believe for not doing the constant folding by
compiler here is that it handles one translation unit (file) at a time
and tomorrow you could also say the following in your case.

/* file main.c */

extern int x;

int a = 10;
static const int b = 20;

const int c = x;

int p[] = {a, b, c};

int main()
{
printf("hello");
return 0;

}

In this case, compiler will not be able to know the value by which to
initialize the p[2].

on the side note, This group is mainly for queries related to gcc
compiler. you should put this query on comp.lang.c their you might
additional help.

-- vIpIn