Questions about pointers to objects and pointers to functions

Hello,

I've got a few questions:

1) Given the two structs
struct A {
    int x;
};

and

struct B {
    struct A y;
    int z;
};

is it ok to treat a "pointer to an object of type struct B" as a "pointer to an object of type struct A"?
(I think someone asked something like this some time ago, but unfortunately I can't find the article anymore)

2) When I now have a function pointer of type
void (*fpa)(struct A *, int);
and a function pointer of type
void (*fpb)(struct B *, int);

and the corresponding functions
void fa(struct A*,int);
and
void fb(struct B*,int);

is it ok to assign a "pointer to fa" to fpb and call the function through fpb with a "pointer to an object of type struct B" as the first parameter?

Thanks in advance
Marc Thrun
.

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