I have two structures declared this way:

struct dot {
int x, y;
};

struct pig : dot {
int a;
}

I can declare dot variable like this: dot a = {1, 100};

But how can I declare pig variable? The only way I found is this:

pig b; b.x = 1; b.y = 100; b.z = 2134;

Is there any way to do it easier, like with dot variables?
I tried this: pig b = {1, 100, 2133} but it doesn't work.
Please, help!