#include <stdio.h>
#include <stdlib.h>

typedef struct {
  float foo;
  float bar;
} Values;

int capacity = 20;

int main()
{
  int a;
  void *p = malloc(sizeof(Values) + (sizeof(int) * 20));
  int *b = (int *)(p + sizeof(Values));
  Values *c = (Values *)p;
  c->foo = 10.0f;
  c->bar = 12.0f;
  for (int i = 0; i < 20; i++)
    b[i] = i;

  for (int i = 0; i < 20; i++)
    printf("values is %i\n", b[i]);

  printf("c->foo: %f\n", c->foo);
  printf("c->bar: %f\n", c->bar);

  Values *d = (Values *)b - 1;
  printf("d->foo: %f\n", d->foo);
  printf("d->bar: %f\n", d->bar);

  return 0;
}