Structures initialization in c

Question

How to initialize a structure which contains other structure definitions inside it?.

Ex:

struct foo{
    struct foo1{
        int a;
        int b;
        int c;
    } abc;
} xyz;

how do you initialize a simple struct? – Karoly Horvath Feb 20 '14 at 11:13 — Karoly Horvath, Feb 20 '14 at 11:13

score 3 · Accepted Answer · answered Feb 20 '14 at 11:12

3

The easiest with modern C are designated initializers

struct foo xyz = { .abc = { .a = 56, } };

But beware that C doesn't have nested types, your foo1 is also a global type.

Generally people prefer to separate such type declaration, first the one for foo1 and then foo, from variable declarations and definitions.

answered Feb 20 '14 at 11:12

Jens Gustedt

I was just expecting this answer.. thank you very much – Vishwanath gowda k Feb 26 '14 at 09:20

score 0 · Answer 2 · answered Feb 20 '14 at 13:53

0

@JensGustedt shows the nice modern C way of doing it. The older school C way would be:

struct foo xyz = { { 1, 2, 3 } };   /* sets a, b, c to 1, 2, 3, respectively */
struct foo xyz = { { 1 } };         /* just sets the member "a" to 1

answered Feb 20 '14 at 13:53

lurker

2 Answers2