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The offsetof macro in C

#include <stdio.h> #include <stdlib.h> #include <string.h> typedef struct Example { int x; // 4 bytes char y; // 1 byte // 3 bytes pad int z; // 4 bytes } Example; typedef struct Example2 { long long x; Example e; } Example2; int main(int argc, char* argv[]) { Example t; printf("Size: %llu\n", sizeof(t)); printf("Offset of 'e' within Example2 is %llu\n", offsetof(Example2, e)); return 0; }