1  #include <stdlib.h>
       2  #include <stdio.h>
       3  #include <stddef.h>
       4  
       5  struct s { int n; double d[]; };
       6  
       7  int main(void)
       8  {
       9    int m = getchar ();
      10    struct s *p = malloc (offsetof (struct s, d)
      11                          + m * sizeof (double));
      12    p->d[0] = 0.0;
      13    return p->d != (double *) NULL;
      14  }