Question

I know the initial value of an array is 0 when defined as static and undefined otherwise, but I’m not entirely sure if this is the same way when the array is typedef’d. I think so, but I want to confirm it.

Just to make it clear, I mean something like this:

typedef float vector3[3];

int main (int argc, char* argv) {
    vector3 vec;
    static vector3 vec2;
}

The vec variable would be undefined, wouldn’t it? What about vec2? It should be all 0, right?

Answer 1

Yes, the values in vec would be undefined; the values in vec2 would be all zeroes.

The use of a typedef makes no difference to the behaviour of the type when variables are defined or declared.