Thread: 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.

Code:

#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

*/

Here is a good example for you

ssharish2005

Here is a good example for you

And where do you initialize Node1 pointer?

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

You also assume malloc succeeds and doesn't fail

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