#include<stdio.h>

struct A{   //Size of struct A should be 1+1+4+1+1=8 Bytes
char a, b;
int I;
char c,d;
};

struct B{  //Size of B is 8 bytes; Properly packed
char a, b, c, d;
int I;
};

int main(){
	
    printf("Asize=%ld Bsize=%ld\n",sizeof(struct A), sizeof(struct B));
    return 0;
}

/*
 * $./a.out
   Asize=12 Bsize=8 
 * */