Количество молекул воды в заданном объеме

static int stack_map_get_next_key(struct bpf_map *map, void *key,
                  void *next_key)
{
    struct bpf_stack_map *smap = container_of(map,
                          struct bpf_stack_map, map);
    u32 id;
 
    WARN_ON_ONCE(!rcu_read_lock_held());
 
    if (!key) {
        id = 0;
    } else {
        id = *(u32 *)key;
        if (id >= smap->n_buckets || !smap->buckets[id])
            id = 0;
        else
            id++;
    }
 
    while (id < smap->n_buckets && !smap->buckets[id])
        id++;
 
    if (id >= smap->n_buckets)
        return -ENOENT;
 
    *(u32 *)next_key = id;
    return 0;
}
 
static int stack_map_update_elem(struct bpf_map *map, void *key, void *value,
                 u64 map_flags)
{
    return -EINVAL;
}
 
/* Called from syscall or from eBPF program */
static int stack_map_delete_elem(struct bpf_map *map, void *key)
{
    struct bpf_stack_map *smap = container_of(map, struct bpf_stack_map, map);
    struct stack_map_bucket *old_bucket;
    u32 id = *(u32 *)key;
 
    if (unlikely(id >= smap->n_buckets))
        return -E2BIG;
 
    old_bucket = xchg(&smap->buckets[id], NULL);
    if (old_bucket) {
        pcpu_freelist_push(&smap->freelist, &old_bucket->fnode);
        return 0;
    } else {
        return -ENOENT;
    }
}
 
/* Called when map->refcnt goes to zero, either from workqueue or from syscall */
static void stack_map_free(struct bpf_map *map)
{
    struct bpf_stack_map *smap = container_of(map, struct bpf_stack_map, map);
 
    /* wait for bpf programs to complete before freeing stack map */
    synchronize_rcu();
 
    bpf_map_area_free(smap->elems);
    pcpu_freelist_destroy(&smap->freelist);
    bpf_map_area_free(smap);
    put_callchain_buffers();
}
 
const struct bpf_map_ops stack_map_ops = {
    .map_alloc = stack_map_alloc,
    .map_free = stack_map_free,
    .map_get_next_key = stack_map_get_next_key,
    .map_lookup_elem = stack_map_lookup_elem,
    .map_update_elem = stack_map_update_elem,
    .map_delete_elem = stack_map_delete_elem,
};

#include <stdio.h>
int main () {
    double mmv=3.0e-23;
    double qv=950;
    double v, kmv;
    printf("vvedite kolichestvo vody v kvartakh ");
    scanf("%lf", &v);
    kmv=v*qv/mmv;
    printf("%.0f\n", kmv);
    return 0;
}