Are c struct members guaranteed to be initialized to 0?

Question

When I declare a structure in C, am I sure that the members will be initialized with some specific value, like 0 for integer members?

EDIT:

So, let's say I have a structure that looks like this:

typedef struct
{
     int a;
} my_str;

and I declare:

my_str thing1;

worldwide. According to some answers thing1.a will be initialized to 0 - do I understand this correctly?

Answer 1

Relevant parts of C99 standard:

section 6.2.4, §3:

, , static . - , , .

6.2.4, §4:

, static- .

6.2.4, §5 ( ):

. , , ; , .

6.7.8, §10:

, , . , , :

- , ;

- type, ( ) ;

- , () ;

- , () .

Answer 2

, ( , ) 0. .

Answer 3

ANSI C standard: , , , , 0, , . , ,

Answer 4

++ .

- , . . , struct . , . , static , .

Answer 5

.

, MS V++ .

Answer 6

. . , , , ​​.

EDIT: Yes, I forgot to mention the static variables inside the function.