C :: Allocating And Freeing Memory For Array Of Structures

I have to allocate memory for an array of structures, and my structure looks as following:

Code:
typedef struct {
char *name;
Uint *start_pos;
Uint len;
}
example_struct;

And now I want to allocate memory, for a variable number (so an array) of example_struct, so I first do:
Code:

example struct *all_struct;
int total_num = 3;
//will be set somehow, but for the example I set it on 3 all_struct = malloc (sizeof(example_struct) * total_num);

And now, as far as I now, I will have to allocate for each field of the structure memory, in order to be able to use it later. But I have problem at this point, a problem of understanding:

- I just allocated memory for 3 structures, but don't I have to allocate then memory for each structure separately, or can I just now allocate the fields like this:

Code: all_struct[0].name = malloc.....

But if yes, why the hell this works...