Access values of structures when the structure is nested.

the "struct" for B should look like:

// use the typedef for "A"
typedef struct B {
    reference int;
    A xxx;
} record_b;


to access the info,

B my_b;
// ....
int my_number = my_b.xxx.number;

BTW, you may want to use "char *" for name, not just "char" as the latter is just a single character, and it looks like its for storing a name....

SOunds good....

In struct b what datatype should I declare record_a as? (i.e. what should XXX be?)

Forget my dumbass last question about datatypes! record_a *is* the datatype.
And I dont even have the excuse of not enough coffee just having had my 4th :)
I'll check this out later this morning (just writing the wraparound code) and will close this question after that.

Many Thanks
J

XXX can be any identifier.Name it something indicative of what it stores.

For instance,

typedef struct B {
   int reference;
   record_a structA;
} record_b;

You can access it like:

record_b.structA.name='a';

If you are working with a pure C compiler you need to specify 'struct' and not record_a alone as data type:

typedef struct B {
   int reference;
   record_a structA;
} record_b;

must be:

typedef struct B {
   int reference;
   struct record_a structA;   /* <---- here */
} record_b;

jaime_olivares, the typedef is standard C, AFAIK, so doing "record_a xxx" is correct.

as an asside, I personally generally stay away from using typedef with strut, as it hides the nature too much (I probably got this habit from embedded programming...) whereby I would code it as:

struct A {
    int number;
    char name;
};

struct B {
    int reference;
    struct A xxx;
};

struct B my_b;
// etc

but the author used the typedef's, so I followed that suit...

cheers,
C.

All,

I've been using:

typedef struct A {
    int number;
    char name;
}A;

typedef struct B {
    int reference;
    A xxx;
}B;

for ages and I havent yet found a compiler that objects. The bonus is that you can use 'A' or 'struct A', whichever is your preference.

Paul

>>If I have a nested structure such as:
>>........
>>1. What do I have to define record_a as in struc B?
>>record_a is the type definition of A.
>>so you can declare

struct A Record_A ;
or
record_a Record_A;
both are same.

>>2. What is the syntax to reference say the field called "name" if I am looking at struct B?
>>In other languages it would be something like:
>>return_name = record_b.record_a.name
>>Thats the sort of thing I'm trying to do!

You have to create an instance

typedef struct A {  
    char *name;
    int number;
} record_a;

typedef struct B {
   int reference;
   record_a  Record_A;
} record_b;

int main(void)
{  
   record_b Record_B;
  ..........................

  printf("%d %s",Record_B.Record_A.number,Record_B.Record_A.name );

 ..............................

}

28 to 31 is 3 days in my book? Whatever..