gistfile1.txt

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

struct hoge { int num; };

int* pick_num(struct hoge *h)
{
    int *copy = &h->num;
    free(&h);
    return copy;
}

int main(void)
{
    struct hoge *x;
    x = (struct hoge *) malloc (sizeof(struct hoge));
    x->num = 5;

    int *y = pick_num(x);

    printf("%i\n", x->num);
    printf("%i\n", *y);

    return 0;
}