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#include <stdlib.h>
 
struct gadget {
  int i;
  double d;
  char *p;
};
 
struct widget {
  char *q;
  int j;
  double e;
};
 
struct gadget *gp;
struct widget *wp;
 
gp = (struct gadget *)malloc(sizeof (struct gadget));
/* ... */
wp = (struct widget *)realloc(gp, sizeof(struct widget));
if (wp->j == 12) {
  /* ... */
}

#include <stdlib.h>
#include <string.h>
 
struct gadget {
  int i;
  double d;
  char *p;
};
 
struct widget {
  char *q;
  int j;
  double e;
};
 
struct gadget *gp;
struct widget *wp;
 
gp = (struct gadget *)malloc(sizeof (struct gadget));
/* ... */
wp = (struct widget *)realloc(gp, sizeof(struct widget));
memset(wp, 0, sizeof(struct widget));
/* ... */
if (wp->j == 12) {
  /* ... */
}