这个为什么读不出来呢~~

#include 
#include 
#include 

typedef struct student
{
char name[10];
int  nID;
}STU;


int main()
{
STU s1;
strcpy(s1.name,"wang");
s1.name[4]='';

s1.nID = 1001;
STU s2;
strcpy(s2.name,"zhang");
s1.name[5]='';
s1.nID = 1002;
  int segment_id;
char *shared_memory;
struct shmid_ds shmbuffer;
int segment_size;
const int share_segment_size =0X5400;

segment_id = shmget(IPC_PRIVATE,share_segment_size,IPC_CREAT|IPC_EXCL|S_IRUSR|S_IWUSR);
shared_memory = (char *) shmat(segment_id,0,0);
printf("shared memory attached at address %p]n",shared_memory);
shmctl(segment_id,IPC_STAT,&shmbuffer);
segment_size = shmbuffer.shm_segsz;
printf("segment size :%dn",segment_size);
memcpy(shared_memory,&s1,sizeof(s1));

shmdt(shared_memory);


shared_memory =(char *) shmat(segment_id,(void *)0X500000,0);
printf("shared memory attached at address %pn",shared_memory);

printf("%s",(STU)shared_memory->name);
printf("%d",(STU)shared_memory->nID);


shmctl(segment_id,IPC_RMID,0);


return 0;
}

printf("%s",(STU)shared_memory->name);
printf("%d",(STU)shared_memory->nID);
改成
  printf ("%s", ((STU*)shared_memory)->name);
  printf ("%d", ((STU*)shared_memory)->nID);