#define ERROR 0

#define OK 1

struct STU

{ char name[20];

char stuno[10];

int age; int score;

}stu[50];
//这个结构体数组有啥用？
struct LIST

{ struct STU stu[50];
int length;}L;//上面结构体数组有啥用？

int printlist(struct LIST L)

{ int i;

printf("name s tuno age score\n");

for(i=0;i<L.length;i++)

printf("%s %s\t%d\t%d\n", L.stu[i].name, L.stu[i].stuno, L.stu[i].age, L.stu[i].score);

printf("\n");

}

int listinsert(struct LIST *L,int i,struct STU e)

{ struct STU *p,*q;

if (i<1||i>L->length+1)

return ERROR;

q=&(L->stu[i-1]);

for(p=&L->stu[L->length-1];p>=q;--p)
//郁闷for中第一个表达式第一次执行p=&L->STU(-1)吗？
*(p+1)=*p; *q=e; ++L->length;

return OK;

}/*ListInsert Before i */

main()

{ struct STU e;

L.length=0;

strcpy(e.name,"zmofun");

strcpy(e.stuno,"100001");

e.age=80;

e.score=1000;

listinsert(&L,1,e);

printlist(L);

printf("List length now is %d.\n\n",L.length);

strcpy(e.name,"bobjin");

strcpy(e.stuno,"100002");

e.age=80;

e.score=1000;

listinsert(&L,1,e);

printlist(L);

printf("List length now is %d.\n\n",L.length);

}