Struct Padding

Code

#include <stdio.h>
#include <stdint.h>
typedef struct {
    char a;
    int b;
    short c;
} MyStruct;

void print_offsets() {
    MyStruct s;
    uint8_t *p2s, *p2a, *p2b, *p2c;

    p2s = (uint8_t *) &s;
    p2a = (uint8_t *) &s.a;
    p2b=  (uint8_t *) &s.b;
    p2c=  (uint8_t *) &s.c;

    printf("Offset of a: %u\n", (p2a - p2s));
    printf("Offset of b: %u\n",  (p2b - p2s));
    printf("Offset of c: %u\n", (p2c - p2s));
    printf("Size: %u", sizeof(s));
}

int main() {
    print_offsets();
    return 0;
}

Solving Approach

get the addresses to all the structure elements in pointers to uint8_t

do pointer arithmetics