Question

I have a question in initializing my structure array inside a structure array. for example if I have a code as below:

#include <stdio.h>

int main() {

typedef struct {
    int a;
    int b;
    int c;
} FIRST_T;

typedef struct {
    int x;
    int y;
    int z;
    FIRST_T *p;
} SECOND_T;

FIRST_T p1[]={{1,2,3},{3,4,5},{6,7,8}};
FIRST_T p2[]={{4,5,6},{7,8,9}};

SECOND_T my_second[]=
{
{1,2,3,p1},
{4,5,6,p2}
};

}

if I have to initialize my first array in second array intialization part itself, then how would I write my typedef of SECOND_T?
like

SECOND_T my_second[]=
{
{1,2,3,{{1,2,3},{4,5,6},{7,8,9}}},
{4,5,6,{{1,1,1},{2,2,2}}}
};

then how should be my SECOND_T?

I am sure I can’t define it as:

typedef struct {
    int x;
    int y;
    int z;
    FIRST_T p[]; //(I know its a blunder)
} SECOND_T;

Please help.

Answer 1

You can’t define a type with unbounded array in C, you have to specify the dimension. So you either do:

typedef strut {
    int x;
    int y;
    int z;
    FIRST_T f[SOME_VALUE];
} SECOND_T;

and then initialize SOME_VALUE count of members always, or do it the way you did.