size.c

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stddef.h>

typedef int *ptr_int;

typedef struct unordered {
  int a;
  double b;
  bool c;
} Unordered;

typedef struct ordered_ {
  bool c;
  int a;
  double b;
} Ordered;

int main() {
  printf("int: %lu\n", sizeof(int));
  printf("long: %lu\n", sizeof(long int));
  printf("float: %lu\n", sizeof(float));
  printf("double: %lu\n", sizeof(double));
  printf("word: %lu\n", sizeof(ptr_int));
  printf("---\n");
  printf("Unordered: %lu\n", sizeof(Unordered));
  printf("Offset a: %lu\n", offsetof(Unordered, a));
  printf("Offset b: %lu\n", offsetof(Unordered, b));
  printf("Offset c: %lu\n", offsetof(Unordered, c));
  printf("---\n");
  printf("Ordered: %lu\n", sizeof(Ordered));
  printf("Offset c: %lu\n", offsetof(Ordered, c));
  printf("Offset a: %lu\n", offsetof(Ordered, a));
  printf("Offset b: %lu\n", offsetof(Ordered, b));
}