int main(int argc, char *argv[])
{
  big big1;
  n = 64;

  assert(A_re != NULL && A_im != NULL && W_re != NULL && W_im != NULL);
  // This above line should go in constructor.

  for (i=0; i<10000000; i++) {
    big1.init_array(n, A_re, A_im);
    big1.compute_W(n, W_re, W_im);
    big1.fft(n, A_re, A_im, W_re, W_im);
    big1.permute_bitrev(n, A_re, A_im);