简单的学生管理系统

/*本文件要先建一个file3.dat文件，呵呵，我已经很满意了*/
#include<iostream>
#include<fstream>
#include"string"
#include"conio.h"
using namespace std;
struct Score
{
int num;
char name[30];
char sex;
float score;
};
class Class:public Score
{
private:
void AddData();
void UpdateData();
void SearchData();
void DeleteData();
void AllData();
public:
Score myth;
fstream file;
void Run();
};
void Class::AddData()
{
file.open("file3.dat",ios::out|ios::binary|ios::in);
char tag;
do
{
file.seekg(0,ios::end);
cout<<"请输入学号:"<<endl;
cin>>myth.num;
cout<<"请输入姓名:"<<endl;
cin>>myth.name;
cout<<"请输入性别:"<<endl;
cin>>myth.sex;
cout<<"请输入成绩:"<<endl;
cin>>myth.score;
file.write((char*)&myth,sizeof(myth));
cout<<"继续添加吗(Y/N):"<<endl;
cin>>tag;
//tag=tolower(tag);//将大写字母转换为小写字母
while(tag!='Y'&&tag!='N')
{
cout<<"输入非法，重新输入(Y/N):";
cin>>tag;
}
}while(tag=='Y');
file.close();
}
void Class::UpdateData()
{
cout<<"请输入要修改的学号:"<<endl;
cin>>num;
fstream file("file3.dat",ios::out|ios::binary|ios::in);
file.seekg(0,ios::beg);
while(!file.eof())
{
file.read((char*)&myth,sizeof(myth));
if(num==myth.num)break;
}
if(!file.eof())
{
cout<<"输出原来的学号:"<<myth.num<<endl;
cout<<"输出原来的姓名:"<<myth.name<<endl;
cout<<"输出原来的性别:"<<myth.sex<<endl;
cout<<"输出原来的成绩:"<<myth.score<<endl;
cout<<"输入要修改的学号:"<<endl;
cin>>num;
myth.num=num;
cout<<"输入要修改的姓名:"<<endl;
cin>>name;
strcpy(myth.name,name);
cout<<"输入要修改的性别:"<<endl;
cin>>sex;
myth.sex=sex;
cout<<"输入要修改的成绩:"<<endl;
cin>>score;
myth.score=score;
cout<<"输出修改后的学号:"<<myth.num<<endl;
cout<<"输出修改后的姓名:"<<myth.name<<endl;
cout<<"输出修改后的性别:"<<myth.sex<<endl;
cout<<"输出修改后的成绩:"<<myth.score<<endl;
file.seekg(-sizeof(myth),ios::cur);
file.write((char*)&myth,sizeof(myth));
}
else
{
cout<<"对不起，无学号可以修改:"<<endl;
file.clear();//清除文件标志
}
file.close();
}
void Class::SearchData()
{
cout<<"请输入要查找的学号:"<<endl;
cin>>num;
file.open("file3.dat",ios::out|ios::binary|ios::in);
file.seekg(0,ios::beg);
while(!file.eof())
{
file.read((char*)&myth,sizeof(myth));
if(num==myth.num)break;
}
if(!file.eof())
{
cout<<"输出学号:"<<myth.num<<endl;
cout<<"输出姓名:"<<myth.name<<endl;
cout<<"输出性别:"<<myth.sex<<endl;
cout<<"输出成绩:"<<myth.score<<endl;
}
else
{
cout<<"对不起，无此学号:"<<endl;
file.clear();
}
//file.clear();
file.close();
}
void Class::DeleteData()
{
cout<<"请输入要删除的学号:"<<endl;
cin>>num;
fstream file("file3.dat",ios::out|ios::binary|ios::in);
file.seekg(0,ios::beg);
while(!file.eof())
{
file.read((char*)&myth,sizeof(myth));
if(num==myth.num)break;
}
if(!file.eof())
{
ofstream outfile("tem.dat",ios::app|ios::binary);
cout<<"输出要删除的学号:"<<myth.num<<endl;
cout<<"输出要删除的姓名:"<<myth.name<<endl;
cout<<"输出要删除的性别:"<<myth.sex<<endl;
cout<<"输出要删除的成绩:"<<myth.score<<endl;
file.seekg(0,ios::beg);
file.read((char*)&myth,sizeof(myth));
while(!file.eof())
{
if(num!=myth.num)
{
outfile.write((char*)&myth,sizeof(myth));
}
file.read((char*)&myth,sizeof(myth));
}
file.close();
outfile.close();
remove("file3.dat");//删除文件
rename("tem.dat","file3.dat");//更改文件名
file.open("file3.dat",ios::in|ios::out|ios::binary);//重新打开
}
else
{
cout<<"删除失败!"<<endl;
file.clear();
}
file.clear();
file.close();
}
void Class::AllData()
{
file.open("file3.dat",ios::out|ios::binary|ios::in);
file.seekg(0,ios::beg);
while(!file.eof())
{
if(file.peek()==EOF)//保证无数据时不会输出乱码
break;
file.read((char*)&myth,sizeof(myth));
cout<<"输出学号:"<<myth.num<<endl;
cout<<"输出姓名:"<<myth.name<<endl;
cout<<"输出性别:"<<myth.sex<<endl;
cout<<"输出成绩:"<<myth.score<<endl;
if(file.peek()==EOF)
break;
}
file.clear();
file.close();
}
void Class::Run()
{
int select;
do
{
cout<<"请选择:"<<endl;
cout<<"1.增加数据"<<endl;
cout<<"2.修改数据"<<endl;
cout<<"3.查找数据"<<endl;
cout<<"4.删除数据"<<endl;
cout<<"5.全部数据"<<endl;
cout<<"6.退出:"<<endl;
cin>>select;
while(cin.get()!='\n');
switch(select)
{
case 1:
AddData();
break;
case 2:
UpdateData();
break;
case 3:
SearchData();
break;
case 4:
DeleteData();
break;
case 5:
AllData();
break;
}
}while(select!=6);
}

int main()
{
int i;

printf("                        --------------------------------------------                                \n");
printf("                        |                                          |                                \n");
printf("                        |           Welcome to MIS of Student      |                                \n");
printf("                        |                何青辉          |                                \n");
printf("                        --------------------------------------------                                \n");

printf("                         Please input a number(0..9) to continue!");
scanf("%d",&i);
system("title 简单学生管理系统-何青辉");
system("color 84");
system("cls");
// system("mode con cols=80 lines=30");
Class sco;
sco.Run();
getch();
printf("谢谢使用，祝您好运，再见!\n");
return 0;
}
/*不要建file3.dat文件,加强版*/
#include<iostream>
#include<fstream>
#include"string"
#include"conio.h"
using namespace std;
struct Score
{
int num;
char name[30];
char sex;
float score;
};
class Class:public Score
{
private:
void AddData();//增加数据
void UpdateData();//更新数据
void SearchData();//查找数据
void DeleteData();//删除数据
void AllData();//所有数据
public:
Score myth;
fstream file;
void Run();
Class();
};
Class::Class()
{
ifstream infile("file3.dat",ios::in);
if(!infile)
{
ofstream outfile("file3.dat",ios::out);
outfile.close();
}
else
infile.close();
file.open("file3.dat",ios::out|ios::binary|ios::in);
}
void Class::AddData()
{
char tag;
do
{
file.seekg(0,ios::end);
cout<<"请输入学号:"<<endl;
cin>>myth.num;
cout<<"请输入姓名:"<<endl;
cin>>myth.name;
cout<<"请输入性别:"<<endl;
cin>>myth.sex;
cout<<"请输入成绩:"<<endl;
cin>>myth.score;
file.write((char*)&myth,sizeof(myth));
cout<<"继续添加吗(Y/N):"<<endl;
cin>>tag;
//tag=tolower(tag);//将大写字母转换为小写字母
while(tag!='Y'&&tag!='N')
{
cout<<"输入非法，重新输入(Y/N):";
cin>>tag;
}
}while(tag=='Y');
}
void Class::UpdateData()
{
cout<<"请输入要修改的学号:"<<endl;
cin>>num;
file.seekg(0,ios::beg);
while(!file.eof())
{
file.read((char*)&myth,sizeof(myth));
if(num==myth.num)break;
}
if(!file.eof())
{
cout<<"输出原来的学号:"<<myth.num<<endl;
cout<<"输出原来的姓名:"<<myth.name<<endl;
cout<<"输出原来的性别:"<<myth.sex<<endl;
cout<<"输出原来的成绩:"<<myth.score<<endl;
cout<<"输入要修改的学号:"<<endl;
cin>>num;
myth.num=num;
cout<<"输入要修改的姓名:"<<endl;
cin>>name;
strcpy(myth.name,name);
cout<<"输入要修改的性别:"<<endl;
cin>>sex;
myth.sex=sex;
cout<<"输入要修改的成绩:"<<endl;
cin>>score;
myth.score=score;
cout<<"输出修改后的学号:"<<myth.num<<endl;
cout<<"输出修改后的姓名:"<<myth.name<<endl;
cout<<"输出修改后的性别:"<<myth.sex<<endl;
cout<<"输出修改后的成绩:"<<myth.score<<endl;
file.seekg(-sizeof(myth),ios::cur);
file.write((char*)&myth,sizeof(myth));
}
else
{
cout<<"对不起，无学号可以修改:"<<endl;
file.clear();//清除文件标志
}
}
void Class::SearchData()
{
cout<<"请输入要查找的学号:"<<endl;
cin>>num;
file.seekg(0,ios::beg);
while(!file.eof())
{
file.read((char*)&myth,sizeof(myth));
if(num==myth.num)break;
}
if(!file.eof())
{
cout<<"输出学号:"<<myth.num<<endl;
cout<<"输出姓名:"<<myth.name<<endl;
cout<<"输出性别:"<<myth.sex<<endl;
cout<<"输出成绩:"<<myth.score<<endl;
}
else
{
cout<<"对不起，无此学号:"<<endl;
file.clear();
}
}
void Class::DeleteData()
{
cout<<"请输入要删除的学号:"<<endl;
cin>>num;
file.seekg(0,ios::beg);
while(!file.eof())
{
file.read((char*)&myth,sizeof(myth));
if(num==myth.num)break;
}
if(!file.eof())
{
ofstream outfile("tem.dat",ios::app|ios::binary);
cout<<"输出要删除的学号:"<<myth.num<<endl;
cout<<"输出要删除的姓名:"<<myth.name<<endl;
cout<<"输出要删除的性别:"<<myth.sex<<endl;
cout<<"输出要删除的成绩:"<<myth.score<<endl;
file.seekg(0,ios::beg);
file.read((char*)&myth,sizeof(myth));
while(!file.eof())
{
if(num!=myth.num)
{
outfile.write((char*)&myth,sizeof(myth));
}
file.read((char*)&myth,sizeof(myth));
}
file.close();
outfile.close();
remove("file3.dat");//删除文件
rename("tem.dat","file3.dat");//更改文件名
file.open("file3.dat",ios::in|ios::out|ios::binary);//重新打开
}
else
{
cout<<"删除失败!"<<endl;
file.clear();
}
file.clear();
}
void Class::AllData()
{
file.seekg(0,ios::beg);
while(!file.eof())
{
if(file.peek()==EOF)//保证无数据时不会输出乱码
break;
file.read((char*)&myth,sizeof(myth));
cout<<"输出学号:"<<myth.num<<endl;
cout<<"输出姓名:"<<myth.name<<endl;
cout<<"输出性别:"<<myth.sex<<endl;
cout<<"输出成绩:"<<myth.score<<endl;
if(file.peek()==EOF)
break;
}
file.clear();
}
void Class::Run()
{
int select;
do
{
cout<<"请选择:"<<endl;
cout<<"1.增加数据"<<endl;
cout<<"2.修改数据"<<endl;
cout<<"3.查找数据"<<endl;
cout<<"4.删除数据"<<endl;
cout<<"5.全部数据"<<endl;
cout<<"6.退出:"<<endl;
cin>>select;
while(cin.get()!='\n');
switch(select)
{
case 1:
AddData();
break;
case 2:
UpdateData();
break;
case 3:
SearchData();
break;
case 4:
DeleteData();
break;
case 5:
AllData();
break;
}
}while(select!=6);
}
int main()
{
int i;
printf("                        --------------------------------------------                                \n");
printf("                        |                                          |                                \n");
printf("                        |           Welcome to MIS of Student      |                                \n");
printf("                        |                       myth               |                                \n");
printf("                        --------------------------------------------                                \n");

printf("                         Please input a number(0..9) to continue!");
scanf("%d",&i);
system("title 简单学生管理系统-myth");
system("color 84");
system("cls");
//system("mode con cols=80 lines=30&color 9f");
Class sco;
sco.Run();
getch();
printf("谢谢使用，祝您好运，再见!\n");
return 0;
}