Memory allocation in Structure to Structure

[pra_ramli]

Hi all,
While coding, I got struck up in memory allocation for structure to
structure..
For instance..I wrote the following pgm..

#include <iostream.h>
#include <stdlib.h>

typedef struct A
{
int b;
int c;
struct E {
int d;
int e;
} *E;
} A;

void main()
{
A* i = (A * ) calloc(1,sizeof(A);
}

I need to allocate memory for the internal structure E. Iam getting
errors whatever format I follow.. i tried the following..
A.E = (E * ) calloc(1,sizeof(E);
A.E = (A.E * ) calloc(1,sizeof(E);
and other combinations..

Can anybody help me to sort out this problem???

Cheers,
Nick

 

[TB]

(e-mail address removed) skrev:

Hi all,
While coding, I got struck up in memory allocation for structure to
structure..
For instance..I wrote the following pgm..

#include <iostream.h>
#include <stdlib.h>

typedef struct A

Are you writing C or C++?

{
int b;
int c;
struct E {
int d;
int e;
} *E;
} A;

struct A {
struct E { };
E * f;
};

void main()
{
A* i = (A * ) calloc(1,sizeof(A);

A * i = new A;
i.f = new A::E;

}

I need to allocate memory for the internal structure E. Iam getting
errors whatever format I follow.. i tried the following..
A.E = (E * ) calloc(1,sizeof(E);
A.E = (A.E * ) calloc(1,sizeof(E);
and other combinations..

Can anybody help me to sort out this problem???

Make sure the code is at least syntactically correct before you post.

 

[pra_ramli]

I modified to the code as following and now it is working
#include <iostream.h>
#include <stdlib.h>

typedef struct A
{
int b;
int c;
struct E {
int d;
int e;
} *F;
}A;
A b;
void main()
{


b.F = new A::E; //mem alloc using new for a Nested Struct
b.F = (A::E* ) calloc(1,sizeof(A)); //second way.c the declartion
of struct


}