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

It is a GCC extension that the current MSVC does not support. You can replace it in MSVC fairly easily with an _alloca (a stack allocation that requires no manual deallocation on the part of the programmer):

#include 

...

int *k = (int *)_alloca(sizeof(*k)*r);