The Size and Address of Unions

The Size and Address of Structure and Unions

#include<stdio.h>

#include<stdlib.h>

struct stag

{

            char c;

            int i;

            float f;

            double d;

};

union utag

{

            char c;

            int i;

            float f;

            double d;

};

main()

{

            struct stag s;

            printf("\n size of structure=%u", sizeof(struct stag));

            printf("\n size of structure=%u", sizeof(s));

            printf("\n address of structure=%u", &s);

            printf("\n address of structure members: %u %u %u %u", &s.c, &s.i, &s.f, &s.d);

            union utag u;

            printf("\n size of union=%u",sizeof(union utag));

            printf("\n size of union=%u",sizeof(u));

            printf("\n address of union=%u",&u);

            printf("\n address of union members: %u %u %u %u",&u.c,&u.i,&u.f,&u.d);

}

Output:

 size of structure=24

 size of structure=24

 address of structure=2686752

 address of structure members: 2686752      2686756          2686760          2686768

 size of union=8

 size of union=8

 address of union=2686744

 address of union members: 2686744            2686744          2686744          2686744