C++大一学生管理系统（显示、删除、查询数据）

#include
#include
#include<Windows.h>
#include
#include
using namespace std;
string number;
bool student; //定义布尔型变量，方便判断是否查找到学生
class Student
{
public:
Student(string nu = " ", string na = " ", char se = 0, double sc = 0, string te = " ", string wh = " ") :num(nu), name(na), sex(se), score(sc), tel(te), where(wh) {}
void _1121s_add1();
void _1121s_show();
void _1121s_find();
void _1121s_delete();
void _1121s_save1();
void _1121s_save2();
void _1121s_export();
void _1121s_change();
friend void _1121s_exportfile(string