Copying arrays of structs in C

Question

It's been a long since I don't use C language, and this is driving me crazy. I have an array of structs, and I need to create a function which will copy one array to another (I need an exact copy), but I don't know how to define the function call. I guess I need to use pointers, but when I try it gives me an error.

struct group{
    int weight;
    int x_pos;
    int y_pos;
    int width;
    int height;
};

struct group a[4];
struct group b[4];

copySolution(&a, &b);

That last declaration send me an error. As I said, it's been a long since programming in C, so I'm a bit lost right now :(

Answer 1

That should do it:

memcpy(&b, &a, sizeof(a));

EDIT: By the way: It will save a copy of a in b.

Answer 2

As Johannes Weiß says, memcpy() is a good solution.

I just want to point out that you can copy structs like normal types:

for (i=0; i<4; i++) {
    b[i] = a[i]; /* copy the whole struct a[i] to b[i] */
}