1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 int main ()
5 {
6 struct base {
7   int basic;
8 };
9 
10 struct derived {
11   struct base common;
12   char extra;
13 };
14 
15 struct base *bp;
16 
17 bp = (struct base *) malloc (sizeof (struct derived));
18 
19 bp->basic = 10;
20 ((struct derived *)bp)->extra = 'x';
21 return 0;
22 }
23