Struct Padding

Code

#include <stdio.h>


typedef struct {
    char a;
    int b;
    short c;
} MyStruct;

void print_offsets() {
    // create an object
    MyStruct object;
    // Compute offsets using pointer arithmetic
    size_t offset_a = (size_t)((char*)&object.a - (char*)&object);
    size_t offset_b = (size_t)((char*)&object.b - (char*)&object);
    size_t offset_c = (size_t)((char*)&object.c - (char*)&object);
    // print offsets
    printf("Offset of a: %zu\n", offset_a);
    printf("Offset of b: %zu\n", offset_b);
    printf("Offset of c: %zu\n", offset_c);
    printf("Size: %zu\n", sizeof(MyStruct)); 
}

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

Solving Approach