#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main ()
{
struct base {
int basic;
};
struct derived {
struct base common;
char extra;
struct derived d;
struct base *bp;
bp = (struct base *)&d;
bp->basic = 10;
((struct derived *)bp)->extra = 'x';
return 0;
}