Variable Sized Arrays in C

Question

I guess my question is whether the following is valid C

int main(void) {
  int r = 3;
  int k[r];
  return 0;
}

If so, would some one care

Answer 1

I'm sorry this is not an answer, but I'd like to point out a potential problem with using variable-length arrays. Most of the code that I have come across looks like this.

void foo(int n)
{
    int bar[n];
    .
    .
}

There is no explicit error checking here. A large n can easily cause problems.