时间：2021-07-01 10:21:17 帮助过：8人阅读
#include
#include
#include
#include
#pragma comment(lib,"ws2_32")
#pragma comment(lib,"libmysql")
using namespace std;
class Student
{
int id;
char name[200];
char sex[100];
char min_zu[220];
char ji_guan[330];
char sheng_fen_zheng_hao[20];
char QQ[20];
char phone[20];
int score;
public:
void show_table();
int main_menu();
void input();
int xiu_gai();
int xiu_gai_menu();
int cha_xun();
int cha_xun_menu();
int del();
int shan_menu();
int score_tong_ji();
int score_tong_ji_menu();
};
class Xu_gai:public Student//修改类
{
public:
void xiu_gai_xue_hao();
void xiu_gai_xing_ming();
void xiu_gai_xing_bie();
void xiu_gai_min_zu();
void xiu_gai_ji_guan();
void xiu_gai_shen_fen_zheng_hao();
void xiu_gai_QQ_hao();
void xiu_gai_dian_hua();
void xiu_gai_cheng_ji();
};
class Cha_xun:public Student//查询类
{
public:
void xue_hao_cha_xun();
void xing_ming_cha_xun();
};
class Shan_chu:public Student//删除类
{
public:
void xue_hao_shan_chu();
void xing_ming_shan_chu();
};
class Score:public Student//成绩统计类
{
public:
void cheng_ji_pai_xu();
void zui_gao_zui_di_fen_xin_xi();
void ping_jun_fen();
void ji_ge_lv();
};
void Score::ji_ge_lv()//全体学生的及格率
{
Student zhao;
system("pause");
system("cls");
zhao.show_table();
MYSQL mysql;
mysql_init(&mysql);
MYSQL_RES *resultset;
MYSQL_ROW row;
mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "latin1");
if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0))
{
printf("/n数据库连接发生错误!");
}
else
{
float a,b;
mysql_query(&mysql,"select count(*) from xueji where score >= 450");
cout<<"及格人数:";
resultset=mysql_store_result(&mysql);
if(mysql_num_rows(resultset)!=NULL)
{
int numFields = mysql_num_fields(resultset);
while(row=mysql_fetch_row(resultset))
{
cout< a = atoi(row[0]); cout< } } mysql_query(&mysql,"select count(*) from xueji"); cout<<"总人数:"; resultset=mysql_store_result(&mysql); if(mysql_num_rows(resultset)!=NULL) { int numFields = mysql_num_fields(resultset); while(row=mysql_fetch_row(resultset)) { cout< b = atoi(row[0]); cout< } } cout<<"及格率："; cout << ((a/b)*100)<<"%" << endl< mysql_free_result(resultset); } } void Score::ping_jun_fen()//全体学生的平均分 { Student zhao; system("pause"); system("cls"); zhao.show_table(); MYSQL mysql; mysql_init(&mysql); MYSQL_RES *resultset; MYSQL_ROW row; mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { printf("/n数据库连接发生错误!"); } else { float a,b; mysql_query(&mysql,"select avg(score) from xueji"); cout<<"平均分:"; resultset=mysql_store_result(&mysql); if(mysql_num_rows(resultset)!=NULL) { int numFields = mysql_num_fields(resultset); while(row=mysql_fetch_row(resultset)) { cout< a = atoi(row[0]); cout< } } mysql_free_result(resultset); } } void Score::zui_gao_zui_di_fen_xin_xi()//最高最低分学生的信息 { Student zhao; system("pause"); system("cls"); zhao.show_table(); MYSQL mysql; mysql_init(&mysql); MYSQL_RES *resultset; MYSQL_ROW row; mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { printf("/n数据库连接发生错误!"); } else { float a,b; mysql_query(&mysql,"select max(score) from xueji"); cout<<"最高分:"; resultset=mysql_store_result(&mysql); if(mysql_num_rows(resultset)!=NULL) { int numFields = mysql_num_fields(resultset); while(row=mysql_fetch_row(resultset)) { cout< a = atoi(row[0]); cout< } } mysql_query(&mysql,"select min(score) from xueji"); cout<<"最低分:"; resultset=mysql_store_result(&mysql); if(mysql_num_rows(resultset)!=NULL) { int numFields = mysql_num_fields(resultset); while(row=mysql_fetch_row(resultset)) { cout< b = atoi(row[0]); cout< } } mysql_free_result(resultset); } } void Score::cheng_ji_pai_xu()//成绩排序 { Student zhao; system("pause"); system("cls"); zhao.show_table(); MYSQL mysql; mysql_init(&mysql); MYSQL_RES *resultset; MYSQL_ROW row; mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { printf("/n数据库连接发生错误!"); } else { cout<<"**************************************开始成绩排名**************************************"< cout<<" 学号 "<<" 姓名 "<<"性别 "<<"民族 "<<"籍贯 "<<" 身份证 "<<" QQ "<<" 电话 "<<" 成绩 "< cout<<"--------------------------------------------------------------------------------------"< mysql_query(&mysql,"select * from xueji order by score desc"); resultset=mysql_store_result(&mysql); if(mysql_num_rows(resultset)!=NULL) { //int numRows = mysql_num_rows(resultset); int numFields = mysql_num_fields(resultset); while(row=mysql_fetch_row(resultset)) { int i; for(i=0;i { cout<<" "< } cout< cout<<"--------------------------------------------------------------------------------------"< } } else { cout<<"/n无查询结果！"; } mysql_free_result(resultset); } } void Shan_chu::xing_ming_shan_chu()//按姓名删除 { Student zhao; system("pause"); system("cls"); zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { printf("/n数据库连接发生错误!"); } else { char std[220]; char na[200]; cout<<"请输入要删除学籍信息的学生姓名: "< cin>>na; sprintf(std,"delete from xueji where name='%s';",na); if(mysql_query(&mysql, std)) { cout<<"数据查询发生错误"< } else { cout<<"删除成功！"< } } } void Shan_chu::xue_hao_shan_chu()//按学号删除 { Student zhao; system("pause"); system("cls"); zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { printf("/n数据库连接发生错误!"); } else { char std[220]; int na; cout<<"请输入要删除学籍信息的学生学号: "< cin>>na; sprintf(std,"delete from xueji where id=%d;",na); if(mysql_query(&mysql, std)) { cout<<"数据查询发生错误"< } else { cout<<"删除成功！"< } } } void Cha_xun::xing_ming_cha_xun()//姓名查询 { system("cls"); system("pause"); MYSQL mysql; mysql_init(&mysql); MYSQL_RES *resultset; MYSQL_ROW row; mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; char n[200]; cout<<"请输入要查的姓名："< cin>>n; sprintf(std,"select * from xueji where name='%s';",n); if(mysql_query(&mysql, std)) { printf("/n数据查询发生错误/n"); } else { resultset=mysql_store_result(&mysql); if(mysql_num_rows(resultset)!=NULL) { int numFields=mysql_num_fields(resultset);//**获得表中的字段 while(row=mysql_fetch_row(resultset)) { int i=0; for(i=0;i { mysql_query(&mysql,"SET NAMES LATIN1"); cout<<" "< } cout< } } else { cout<<"显示无果！"; } } mysql_free_result(resultset); } } void Cha_xun::xue_hao_cha_xun()//学号查询 { system("cls"); system("pause"); MYSQL mysql; mysql_init(&mysql); MYSQL_RES *resultset; MYSQL_ROW row; mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; int n; cout<<"请输入要查的学号："< cin>>n; cout<<"--------------------------------------显示查询----------------------------------------"< cout<<" 学号 "<<" 姓名 "<<"性别 "<<"民族 "<<"籍贯 "<<" 身份证 "<<" QQ "<<" 电话 "<<" 成绩 "< cout<<"--------------------------------------------------------------------------------------"< sprintf(std,"select * from xueji where id=%d;",n); if(mysql_query(&mysql, std)) { printf("/n数据查询发生错误/n"); } else { resultset=mysql_store_result(&mysql); if(mysql_num_rows(resultset)!=NULL) { int numFields=mysql_num_fields(resultset);//**获得表中的字段 while(row=mysql_fetch_row(resultset)) { int i=0; for(i=0;i { mysql_query(&mysql,"SET NAMES LATIN1"); cout<<" "< } cout< } cout<<"--------------------------------------------------------------------------------------"< } else { cout<<"显示无果！"; } } mysql_free_result(resultset); } } void Xu_gai::xiu_gai_cheng_ji()//修改成绩 { system("cls"); system("pause"); cout<<"显示学生数据"< Xu_gai zhao; zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; char m[200]; int n; cout<<"对目标学号信息进行修改："< cin>>n; cout<<"请输入要新的成绩："< cin>>m; sprintf(std,"update xueji set score='%s' where id=%d;",m,n); if(mysql_query(&mysql, std)) { printf("/n数据库更改发生错误/n"); } else { printf("/n数据库更改数据成功/n"); } } } void Xu_gai::xiu_gai_dian_hua()//修改电话 { system("cls"); system("pause"); cout<<"显示学生数据"< Xu_gai zhao; zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; char m[200]; int n; cout<<"对目标学号信息进行修改："< cin>>n; cout<<"请输入要新的电话："< cin>>m; sprintf(std,"update xueji set phone='%s' where id=%d;",m,n); if(mysql_query(&mysql, std)) { printf("/n数据库更改发生错误/n"); } else { printf("/n数据库更改数据成功/n"); } } } void Xu_gai::xiu_gai_QQ_hao()//修改QQ号 { system("cls"); system("pause"); cout<<"显示学生数据"< Xu_gai zhao; zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; char m[200]; int n; cout<<"对目标学号信息进行修改："< cin>>n; cout<<"请输入要新的QQ号："< cin>>m; sprintf(std,"update xueji set QQ='%s' where id=%d;",m,n); if(mysql_query(&mysql, std)) { printf("/n数据库更改发生错误/n"); } else { printf("/n数据库更改数据成功/n"); } } } void Xu_gai::xiu_gai_shen_fen_zheng_hao()//修改身份证号************************************************************ { system("cls"); system("pause"); cout<<"显示学生数据"< Xu_gai zhao; zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; char m[200]; int n; cout<<"对目标学号信息进行修改："< cin>>n; cout<<"请输入要新的身份证号："< cin>>m; sprintf(std,"update xueji set sheng_fen_zheng_hao='%s' where id=%d;",m,n); if(mysql_query(&mysql, std)) { printf("/n数据库更改发生错误/n"); } else { printf("/n数据库更改数据成功/n"); } } } void Xu_gai::xiu_gai_ji_guan()//修改籍贯 { system("cls"); system("pause"); cout<<"显示学生数据"< Xu_gai zhao; zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; char m[200]; int n; cout<<"对目标学号信息进行修改："< cin>>n; cout<<"请输入要新的籍贯："< cin>>m; sprintf(std,"update xueji set ji_guan='%s' where id=%d;",m,n); if(mysql_query(&mysql, std)) { printf("/n数据库更改发生错误/n"); } else { printf("/n数据库更改数据成功/n"); } } } void Xu_gai::xiu_gai_min_zu()//修改民族 { system("cls"); system("pause"); cout<<"显示学生数据"< Xu_gai zhao; zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; char m[200]; int n; cout<<"对目标学号信息进行修改："< cin>>n; cout<<"请输入要新的民族："< cin>>m; sprintf(std,"update xueji set min_zu='%s' where id=%d;",m,n); if(mysql_query(&mysql, std)) { printf("/n数据库更改发生错误/n"); } else { printf("/n数据库更改数据成功/n"); } } } void Xu_gai::xiu_gai_xing_bie()//修改性别 { system("cls"); system("pause"); cout<<"显示学生数据"< Xu_gai zhao; zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; char m[200]; int n; cout<<"对目标学号信息进行修改："< cin>>n; cout<<"请输入要新的性别："< cin>>m; sprintf(std,"update xueji set sex='%s' where id=%d;",m,n); if(mysql_query(&mysql, std)) { printf("/n数据库更改发生错误/n"); } else { printf("/n数据库更改数据成功/n"); } } } void Xu_gai::xiu_gai_xing_ming()//修改姓名 { system("cls"); system("pause"); cout<<"显示学生数据"< Xu_gai zhao; zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; char m[200]; int n; cout<<"对目标学号信息进行修改："< cin>>n; cout<<"请输入要新的姓名："< cin>>m; sprintf(std,"update xueji set name='%s' where id=%d;",m,n); if(mysql_query(&mysql, std)) { printf("/n数据库更改发生错误/n"); } else { printf("/n数据库更改数据成功/n"); } } } void Xu_gai::xiu_gai_xue_hao()//修改学号 { system("cls"); system("pause"); cout<<"显示学生数据"< Xu_gai zhao; zhao.show_table(); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { char std[200]; int n,m; cout<<"请输入要修改的学号："< cin>>n; cout<<"请输入要新的学号："< cin>>m; sprintf(std,"update xueji set id=%d where id=%d;",m,n); if(mysql_query(&mysql, std)) { printf("/n数据库更改发生错误/n"); } else { printf("/n数据库更改数据成功/n"); } } } int Student::xiu_gai()//定义修改函数 { cout<<"进入修改系统..."< int h; Xu_gai geng_zheng; system("pause"); system("cls"); MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { while(1) { h=geng_zheng.xiu_gai_menu(); switch(h) { case 1: geng_zheng.xiu_gai_xue_hao(); break; case 2: geng_zheng.xiu_gai_xing_ming(); break; case 3: geng_zheng.xiu_gai_xing_bie(); break; case 4: geng_zheng.xiu_gai_min_zu(); break; case 5: geng_zheng.xiu_gai_ji_guan(); break; case 6: geng_zheng.xiu_gai_shen_fen_zheng_hao(); break; case 7: geng_zheng.xiu_gai_QQ_hao(); break; case 8: geng_zheng.xiu_gai_dian_hua(); break; case 9: geng_zheng.xiu_gai_cheng_ji(); break; case 0: return 0; break; default: cout<<"请选择正确的菜单项进行操作。多谢合作!"< } } } return 0; } int Student::cha_xun()//查询 { system("pause"); system("cls"); Cha_xun cha; MYSQL mysql; int h; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { while(1) { h=cha.cha_xun_menu(); switch(h) { case 1: cha.xue_hao_cha_xun(); break; case 2: cha.xing_ming_cha_xun(); break; case 0: return 0; break; default: cout<<"请选择正确的菜单项进行操作。多谢合作!"< } } } return 0; } int Student::del()//删除 { system("pause"); system("cls"); Shan_chu shan; MYSQL mysql; int h; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { while(1) { h=shan.shan_menu(); switch(h) { case 1: shan.xue_hao_shan_chu(); break; case 2: shan.xing_ming_shan_chu(); break; case 0: return 0; break; default: cout<<"请选择正确的菜单项进行操作。多谢合作!"< } } } return 0; } int Student::score_tong_ji()//成绩统计分析 { system("pause"); system("cls"); Score tong_ji; MYSQL mysql; int h; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { while(1) { h=tong_ji.score_tong_ji_menu(); switch(h) { case 1: tong_ji.cheng_ji_pai_xu(); break; case 2: tong_ji.zui_gao_zui_di_fen_xin_xi(); break; case 3: tong_ji.ping_jun_fen(); break; case 4: tong_ji.ji_ge_lv(); break; case 0: return 0; break; default: cout<<"请选择正确的菜单项进行操作。多谢合作!"< } } } return 0; } void Student::input()//录入学生信息 { system("pause"); system("cls"); Student lu_ru; char std[200]; MYSQL mysql; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql, "localhost", "root", "123456", "student", 3306, NULL, 0)) { cout<<"数据库连接错误！"< } else { cout<<"请录入学生信息数据"< mysql_query(&mysql, "SET NAMES LATIN1"); cout<<"学号 "<<"姓名 "<<"性别 "<<"民族 "<<"籍贯 "<<"身份证 "<<"QQ "<<"电话 "<<"成绩 "< cin>>lu_ru.id>>lu_ru.name>>lu_ru.sex>>lu_ru.min_zu>>lu_ru.ji_guan>>lu_ru.sheng_fen_zheng_hao>>lu_ru.QQ>>lu_ru.phone>>lu_ru.score; sprintf(std,"insert into xueji VALUES(%d,'%s','%s','%s','%s','%s','%s','%s',%d);" ,lu_ru.id,lu_ru.name,lu_ru.sex,lu_ru.min_zu,lu_ru.ji_guan,lu_ru.sheng_fen_zheng_hao,lu_ru.QQ,lu_ru.phone,lu_ru.score); mysql_query(&mysql,std); cout<<"添加成功"< } } void Student::show_table()//信息表数据的显示 { system("cls"); MYSQL mysql; MYSQL_RES *resultset; MYSQL_ROW row; mysql_init(&mysql); mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"latin1"); if(!mysql_real_connect(&mysql,"localhost","root","123456","student",3306,NULL,0)) { cout<<"/n数据库连接发生错误！"; } else { if(mysql_query(&mysql,"select * from xueji")) { cout<<"表格数据显示失败！"; } else { cout<<"--------------------------------------显示信息----------------------------------------"< cout<<" 学号 "<<" 姓名 "<<"性别 "<<"民族 "<<"籍贯 "<<" 身份证 "<<" QQ "<<" 电话 "<<" 成绩 "< cout<<"--------------------------------------------------------------------------------------"< resultset=mysql_store_result(&mysql); if(mysql_num_rows(resultset)!=NULL) { int numFields=mysql_num_fields(resultset);//**获得表中的字段 while(row=mysql_fetch_row(resultset)) { int i=0; for(i=0;i { mysql_query(&mysql,"SET NAMES LATIN1"); cout<<" "< } cout< cout<<"--------------------------------------------------------------------------------------"< } } else { cout<<"显示无果！"; } } mysql_free_result(resultset); } } int Student::main_menu()//主菜单 { system("pause"); system("cls"); int s; cout< <<" 1: 录入学生信息 "< <<" 2: 显示学生信息 "< <<" 3: 查找学生信息 "< <<" 4: 删除学生信息 "< <<" 5: 修改学生信息 "< <<" 6: 统计学生成绩 "< <<" 0: 退出系统 "< <<" 请选择:"; cin>>s; return s; } int Student::xiu_gai_menu()//修改菜单 { system("pause"); system("cls"); int a; cout< <<" 1: 修改学号 "< <<" 2: 修改姓名 "< <<" 3: 修改性别 "< <<" 4: 修改民族 "< <<" 5: 修改籍贯 "< <<" 6: 修改身份证 "< <<" 7: 修改QQ号 "< <<" 8: 修改手机号 "< <<" 9: 修改成绩 "< <<" 0: 返回上一层 "< <<" 请选择:"; cin>>a; return a; } int Student::cha_xun_menu()//查询菜单 { system("pause"); system("cls"); int k; cout< <<" 1: 按学号查找 "< <<" 2: 按姓名查找 "< <<" 0: 返回上一层 "< <<" 请选择:"; cin>>k; return k; } int Student::shan_menu()//删除菜单 { system("pause"); system("cls"); int g; cout< <<" 1: 按学号删除 "< <<" 2: 按姓名删除 "< <<" 0: 返回上一层 "< <<" 请选择:"; cin>>g; return g; } int Student::score_tong_ji_menu()//成绩统计菜单 { system("pause"); system("cls"); int d; cout< <<" 1: 对成绩进行排序 "< <<" 2: 最高和最低成绩的学生信息 "<