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struct big {
    unsigned long long memberull_1; /* typically 8 bytes */
    unsigned long long memberull_2; /* typically 8 bytes */
    unsigned long long memberull_3; /* typically 8 bytes */
    int membersi_4; /* typically 4 bytes */
    int membersi_5; /* typically 4 bytes */
};
/* ... */
size_t skip_member = sizeof(unsigned long long);
struct big *s = malloc(sizeof(struct big));
if (!s) {
   /* Handle malloc() error */
}

memset(s + skip_member, 0, sizeof(struct big) - skip_member);
/* ... */
free(s);