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Old 03-06-2007, 09:07 AM   #1
knobby67
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Registered: Mar 2006
Posts: 546

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structure within a structure in C


Hi,
I've been asked to transfer a bit of code from C++ to C. But am having a small bit of trouble with a .h file. Basically it calls a structure from a structure.

so I have
struct A_STRUCTURE
{
float a;
float b;
float c;
};


Then

struct B_STRUCTURE
{
A_STRUCTURE location; <- problem line
float d;
.........


When I build I get the follwing error

test.h:37: error: syntax error before A_STRUCTURE

I'm sure I could move A_STRUCTURE to another .h file, but other that doing that can I decalre a structure calling a structure in a header file in C? (If that makes sense :s )

Thanks

Last edited by knobby67; 03-06-2007 at 09:08 AM.
 
Old 03-06-2007, 09:34 AM   #2
tuxdev
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Registered: Jul 2005
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In C, you either have to use "struct A_STRUCTURE" whenever you reference that type, or use the typedef idiom:
Code:
typedef struct {
   float a;
   float b;
   float c;
} A_STRUCTURE;
My personal preference to use "struct A_STRUCTURE".

Last edited by tuxdev; 03-06-2007 at 09:47 AM.
 
Old 03-06-2007, 09:34 AM   #3
kaz2100
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Registered: Apr 2005
Location: Penguin land, with apple, no gates
Distribution: Debian testing woody(32) sarge etch lenny squeeze(+64) wheezy jessie
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Hi,

You either have to add struct before A_ in definiton of B_
Code:
struct B_STR{
struct A_str loc;
/*^^^^*/
float b;
}
or typedef.

Happy Penguins!
 
Old 03-06-2007, 10:00 AM   #4
knobby67
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Registered: Mar 2006
Posts: 546

Original Poster
Rep: Reputation: 42
Thanks all worked went for struct. All my years programming C and I never knew that. It's nice to learn something so usefull but so easy.
 
  


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