struct attendance* insert(struct attendance *head)
{
struct attendance *temp,p1;
p1=(struct attendance)malloc(sizeof(struct attendance));
printf("请输入学号:");
scanf("%d",&p1->id);
printf("请输入姓名:");
scanf("%s",p1->name);
printf("请输入班级:");
scanf("%s",p1->grade);
printf("请输入状态:");
scanf("%s",p1->attend);
printf("请输入点名时间:");
scanf("%f",&p1->time);
p1->next=NULL;