#include <stdio.h> #include <stdint.h> struct bera{ char a; uint64_t b; }; struct vera{ char a; char b; bera c; }; #define STRUCT_OFFSET(struc, memeber) (&((struc *)0)->memeber)) int main() { printf("%llu, %llu", sizeof(vera), STRUCT_OFFSET(vera, c.b); return 0; }