Padding.c

#include <stdio.h>
#include <string.h>

struct struc1 
{
       int a; int b;
       char c1;
       char c2;
       float f;
};
 
struct struc2 
{
       int a;
       char c1;
       int b;
       char c2;
       float f;                      
};
 

#pragma pack (1)
struct struc3 
{
       int a;
       char c1;
       int b;
       char c2;
       float f;                      
};  
 
int main() 
{
    struct struc1 s1;
    struct struc2 s2;
     struct struc3 s3;
 
    printf("\nsize of s1 in bytes : %u", (int)sizeof(s1));
    printf ( "\n   Address of a        = %p", &s1.a );
    printf ( "\n   Address of b        = %p", &s1.b );
    printf ( "\n   Address of c1       = %p", &s1.c1 );
    printf ( "\n   Address of c2          = %p", &s1.c2 );
    printf ( "\n   Address of f = %p", &s1.f );
 
    printf("\n\nsize of s2 in bytes : %u", (int)sizeof(s2));
    printf ( "\n   Address of a        = %p", &s2.a );
    printf ( "\n   Address of b        = %p", &s2.b );
    printf ( "\n   Address of c1       = %p", &s2.c1 );
    printf ( "\n   Address of c2          = %p", &s2.c2 );
    printf ( "\n   Address of f = %p ", &s2.f );
    
    
    printf("\n\nsize of s3 in bytes : %u", (int)sizeof(s3));
    printf ( "\n   Address of a        = %p", &s3.a );
    printf ( "\n   Address of b        = %p", &s3.b );
    printf ( "\n   Address of c1       = %p", &s3.c1 );
    printf ( "\n   Address of c2          = %p", &s3.c2 );
    printf ( "\n   Address of f = %p \n", &s3.f );
    
    return 0;
}