C++实现简单的学生管理系统
//Student.cpp
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#include<iostream>
using namespace std;
struct Stu
{
char no[10];
char name[16];
int math;
int chi;
double ave;
};
class Student
{
public:
Stu st;
Student * next;
public:
Student(){}
Student(Stu s)
{
st=s;
next=NULL;
st.ave=(st.math+st.chi)/2.0;
}
void setst(Stu s)
{
st=s;
st.ave=(st.math+st.chi)/2.0;
}
Stu getst()
{
return st;
}
void show()
{
cout<<"----------------------------"<<endl;
cout<<"学号:"<<st.no<<endl;
cout<<"姓名:"<<st.name<<endl;
cout<<"数学成绩:"<<st.math<<endl;
cout<<"语文成绩:"<<st.chi<<endl;
cout<<"平均成绩:"<<st.ave<<endl;
cout<<"----------------------------"<<endl;
}
};
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//main.cpp
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#include<fstream>
#include"Student.cpp"
using namespace std;
Student * create_List();
void traverse_List(Student * pHead);
bool is_empty(Student * pHead);
int length_List(Student * pHead);
bool insert_List(Student * pHead,int position,Stu st);
bool delete_List(Student * pHead,int position,Stu * st);
void sort_List(Student * pHead);
void menu_select();
void handle_menu(int s);
void outFile();
Student * inFile();
void delFile();
Student * pHead;
void main()
{
menu_select();
}
void menu_select()
{
int s;
cout<<"请输入您要操作的选项:"<<endl;
cout<<"1.增加原始记录"<<endl;
cout<<"2.按平均分排序显示所有记录"<<endl;
cout<<"3.保存原始文件"<<endl;
cout<<"4.读取原始文件"<<endl;
cout<<"5.删除原始文件"<<endl;
cout<<"6.插入单条记录"<<endl;
cout<<"7.删除单条记录"<<endl;
cout<<"8.显示记录总条数"<<endl;
cout<<"9.结束程序运行"<<endl<<endl;
cout<<"左边数字对应功能选择,请选择1-9:";
cin>>s;
handle_menu(s);
}
void handle_menu(int s)
{
switch (s)
{
case 1:
{
system("cls");
pHead=create_List();
system("cls");
menu_select();
break;
}
case 2:
{
if(NULL==pHead)
{
cout<<"记录总条数为零"<<endl;
getchar();
getchar();
system("cls");
menu_select();
}
system("cls");
sort_List(pHead);
traverse_List(pHead);
getchar();
getchar();
system("cls");
menu_select();
break;
}
case 3:
{
if(pHead!=NULL)
{
system("cls");
outFile();
system("cls");
menu_select();
}
system("cls");
menu_select();
break;
}
case 4:
{
system("cls");
pHead=inFile();
system("cls");
menu_select();
break;
}
case 5:
{
system("cls");
delFile();
system("cls");
menu_select();
break;
}
case 6:
{
if(NULL==pHead)
{
cout<<"记录总条数为零"<<endl;
getchar();
getchar();
system("cls");
menu_select();
}
system("cls");
int num;
Stu st;
traverse_List(pHead);
cout<<"您想在哪条记录后插入,请输入序号:";
cin>>num;
cout<<"编辑要插入的记录:"<<endl;
cout<<"学号:";
cin>>st.no;
cout<<"姓名:";
cin>>st.name;
cout<<"数学成绩:";
cin>>st.math;
cout<<"语文成绩:";
cin>>st.chi;
if(insert_List(pHead,num-1,st))
{
cout<<"插入成功!"<<endl;
}
else
{
cout<<"插入失败!"<<endl;
}
getchar();
getchar();
system("cls");
menu_select();
break;
}
case 7:
{
if(NULL==pHead)
{
cout<<"记录总条数为零"<<endl;
getchar();
getchar();
system("cls");
menu_select();
}
int num;
Stu * st=(Stu *)malloc(sizeof(Stu));
traverse_List(pHead);
cout<<endl<<"请输入您要删除的记录的序号:";
cin>>num;
if(delete_List(pHead,num,st))
{
cout<<endl<<"成功删除的记录如下:"<<endl;
cout<<"学号:"<<st->no<<endl<<"姓名:"<<st->name<<endl;
}
else
{
cout<<"删除失败!"<<endl;
}
getchar();
getchar();
system("cls");
menu_select();
break;
}
case 8:
{
if(NULL!=pHead)
{
system("cls");
cout<<"记录总条数:"<<length_List(pHead)<<"条"<<endl;
getchar();
getchar();
system("cls");
menu_select();
}
else
{
cout<<"记录总条数为零"<<endl;
getchar();
getchar();
system("cls");
menu_select();
}
break;
}
case 9:
{
system("cls");
cout<<"成功退出!"<<endl;
exit(0);
break;
}
}
}
void delFile()
{
ofstream fileout;
fileout.open("c:\\kcsj.txt",ios_base::out);
fileout<<"";
fileout.close();
}
Student * inFile()
{
Student * pHead=(Student *)malloc(sizeof(Student));
if(NULL==pHead)
{
cout<<"分配失败,程序终止!"<<endl;
exit(0);
}
Student * pTail=pHead;
pTail->next=NULL;
ifstream in("c:\\kcsj.txt");
if (!in.is_open())
{
cout << "Error opening file"<<endl;
exit(0);
}
while (!in.eof())
{
Stu st;
in.read(reinterpret_cast<char *>(&st), sizeof(st));
if (in.fail())
{
break;
}
Student * pNew=new Student();
if(NULL==pNew)
{
printf("分配失败,程序终止\n");
exit(0);
}
pNew->setst(st);
pTail->next=pNew;
pNew->next=NULL;
pTail=pNew;
}
in.close();
return pHead;
}
void outFile()
{
ofstream out;
out.open("c:\\kcsj.txt",ios_base::out|ios_base::app|ios::binary);
if(!out)
{
cout<<"文件不存在，退出时别忘记保存文件!"<<endl;
out.close();
out.open("stu.dat",ios_base::out|ios::binary);
}
else
{
out.close();
out.open("c:\\kcsj.txt",ios_base::out|ios_base::app|ios::binary);
}
Student * temp=pHead->next;
while(temp!=NULL)
{
Stu st=temp->getst();
out.write(reinterpret_cast<char *>(&st), sizeof(st));
temp=temp->next;
}
out.close();
}
Student * create_List()
{
int len;
Student * pHead=(Student *)malloc(sizeof(Student));
if(NULL==pHead)
{
cout<<"分配失败,程序终止!"<<endl;
exit(0);
}
Student * pTail=pHead;
pTail->next=NULL;
cout<<"请输入要存储的学生人数:";
cin>>len;
for(int i=0;i<len;i++)
{
Stu st;
cout<<"请输入第"<<i+1<<"个学生的学号:";
cin>>st.no;
cout<<"请输入第"<<i+1<<"个学生的姓名:";
cin>>st.name;
cout<<"请输入第"<<i+1<<"个学生的数学成绩:";
cin>>st.math;
cout<<"请输入第"<<i+1<<"个学生的语文成绩:";
cin>>st.chi;
Student * pNew=new Student();
if(NULL==pNew)
{
printf("分配失败,程序终止\n");
exit(0);
}
pNew->setst(st);
pTail->next=pNew;
pNew->next=NULL;
pTail=pNew;
}
return pHead;
}
void traverse_List(Student * pHead)
{
int i=1;
Student * temp=pHead->next;
while(temp!=NULL)
{
cout<<endl<<"序号:"<<i<<endl;
temp->show();
temp=temp->next;
i++;
}
}
bool is_empty(Student * pHead)
{
if(NULL==pHead->next)
{
return true;
}
else
{
return false;
}
}
int length_List(Student * pHead)
{
int len=0;
Student * temp=pHead->next;
while(temp)
{
len++;
temp=temp->next;
}
return len;
}
bool insert_List(Student * pHead,int position,Stu st)
{
int i=0;
Student * p=pHead;
while(NULL!=p&&i<position-1)
{
p=p->next;
i++;
}
if(i>position-i||NULL==p)
{
return false;
}
Student * pNew=(Student *)malloc(sizeof(Student));
if(NULL==pNew)
{
cout<<"分配失败,程序终止"<<endl;
exit(0);
}
pNew->setst(st);
pNew->next=p->next;
p->next=pNew;
return true;
}
bool delete_List(Student * pHead,int position,Stu * st)
{
int i=0;
Student * p=pHead;
while(NULL!=p->next&&i<position-1)
{
p=p->next;
i++;
}
Student * q=p->next;
*st=q->getst();
p->next=p->next->next;
free(q);
q=NULL;
return true;
}
void sort_List(Student * pHead)
{
Student * p,* q;
Stu temp;
int i,j;
int len=length_List(pHead);
for(i=0,p=pHead->next;i<len-1;i++,p=p->next)
{
for(j=i+1,q=p->next;j<len;j++,q=q->next)
{
if(q->st.ave>p->st.ave)
{
temp=q->st;
q->st=p->st;
p->st=temp;
}
}
}
}
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