Plot details - barchart reports
Derek Atkins
warlord at MIT.EDU
Tue Feb 12 12:58:49 EST 2008
Hi,
"Davide Imbeni" <davide.imbeni at gmail.com> writes:
> Interesting.
>
> I actually got the warnings, but I'm forced to run configure with the
> flag --disable-error-on-warning, so I could compile even though.
>
> But your point makes me wonder about one thing:
>
> As I understand, you get errors with the statement:
>
> GogObject *object = gog_object_get_child_by_role (...);
>
> but not when you correct it as follows:
>
> GogObject *object;
> object = gog_object_get_child_by_role (...);
That's not the problem. The problem is that you have to declare
all your variables at the top of the block of code. I.e., you
CAN have:
GogObject *object = gog_object_get_child_by_role(...);
Provided that it's at the top of the block. E.g.:
{
GogObject *object = gog_object_get_child_by_role(...);
...
}
Is fine. BUT this is not:
{
printf("Hi There\n");
GogObject *object = gog_object_get_child_by_role(...);
...
}
And indeed, just declaring the variable isn't sufficient, either.
This code is ALSO bad:
{
printf("Hi There\n");
GogObject *object;
object = gog_object_get_child_by_role(...);
...
}
But this is okay:
{
GogObject *object;
printf("Hi There\n");
object = gog_object_get_child_by_role(...);
...
}
> Now my question is, why don't you get the same error in the (very
> similar) statement about rotate_row_labels that comes right before?
>
> if (rotate_row_labels) {
> GogObject *object = gog_object_get_child_by_role (
> chart, gog_object_find_role_by_name (chart, "X-Axis"));
> style = gog_styled_object_get_style (GOG_STYLED_OBJECT (object));
> gog_style_set_text_angle (style, 90.0);
> }
>
> It looks like the very same statement to me (I actually copied it
> without understanding too much... :-( )
> What am I missing?
In this latter case, the declaration is at the top of the code block.
So yes, this code is fine.
-derek
--
Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
Member, MIT Student Information Processing Board (SIPB)
URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH
warlord at MIT.EDU PGP key available
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