#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>
#include<conio.h>
#define N 80
typedef struct
{
char num[N];
char name[20];
char tele[15];
char smobile[20];
char emal[30];
}STUDENT;
STUDENT stu[N];
int length1=0;
int menu();
int tianjia(STUDENT stu[N]);
void xianshi(STUDENT stu[],int n);
int shanchu(STUDENT stu[],int n);
void chazhao(STUDENT stu[],int n);
void xiugai(STUDENT stu[],int n);
int tuichu();