Structure inside Structure

Hey guys

I'm having trouble adding and reading a structure inside a structure. I tried double arrows, but that doesn't work.

Code:

---

NOT REAL CODE:
Struct 1{
  otherData  ;
  struct 2 ;
}

struct 2{
    data;
}

---

To Add data: struct 2 I have struct1->struct2->data = something, but doesn't work.
To read data: struct1->struct2->data but that doesn't work.

(struct1->otherData works, but I guess it's because I haven't added the second struc data yet.. )

I've never worked with structs inside structs before so I dont really know. Oh yeah my code is just as an example, not actual code.

any input is highly appreciated.

!! EDIT
I have the pointer of struct 2 I want to add to struct 1.

Use "." not "->"

wow I just read your reply, but I just figured it out too.

My solution:

struct1->struct2 = *ptr;

to read:

&(struct1->struct2)->data;

I'm on a roll answering my stuff. Thanks for the reply though!!

WOW 4 OF JULY HAS ME EXCITED. CANT WAIT FOR THE FIREWORKS

WOOHOOO!!

Quote:

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Originally Posted by tdep

&(struct1->struct2)->data;

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That's sort of a pointless thing to do. &(x)->y means the same as x.y

Code:

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#include <stdio.h>

struct FirstData
{
      int Data;
      struct SecondData
      {
          int dAta;
      } Nested;
};

int main()
{
    struct FirstData Node;
    struct FirstData * Node1;
   
    Node1 = malloc(sizeof(struct FirstData));
    Node.Data = 10;
    Node.Nested.dAta = 20;
    Node1->Nested.dAta = 30;
    Node1->Data = 40;
   
    printf("Nested Structures\n");
    printf("-----------------\n");
    printf("Node.Data              - &#37;d\n", Node.Data);
    printf("Node.Nested.dAta        - %d\n", Node.Nested.dAta);
    printf("Node1->Nested.dAta      - %d\n", Node1->Nested.dAta);
    printf("Node1->Data            - %d\n", Node1->Data);
   
    getchar();
    return 0;
}

/* My output
Nested Structures
-----------------
Node.Data              - 10
Node.Nested.dAta        - 20
Node1->Nested.dAta      - 30
Node1->Data            - 40

*/

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Here is a good example for you

ssharish2005

Quote:

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Here is a good example for you

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And where do you initialize Node1 pointer?

The joys of dealing with a compiler that protects you from yourself. :D

Quote:

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Originally Posted by vart

And where do you initialize Node1 pointer?

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That was a mistake sorry, I have corrected it now. Thanks for pointing it out.

Thanks again.

ssharish2005

You also assume malloc succeeds and doesn't fail ;)

Quote:

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Originally Posted by zacs7

You also assume malloc succeeds and doesn't fail ;)

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Well, it was just an example, could have checked the return value. :rolleyes:

ssharish2005

Still it's a good habit to keep, regardless of the code's purpose.

If you want to build a good example of the code - you should also add the free