学生信息管理系统

5个菜单功能，每个菜单功能含有不同得类，构造函数，至少有一个菜单功能模块含有友元函数，

友元类，多重继承，虚基类，虚函数或抽象类的应用，有异常处理。

 

#include<iostream>
#include<fstream>
#include<string>
using namespace std;

const int Num = 100;//最大学生数
int count = 0;

struct Student{
    string data[5];//存放学号，姓名，性别，政治面貌，家庭住址；
    float goal;//存放c++期末成绩
};
Student Data[Num];//存储学生相关信息

//添加学生信息(友元类)
class AddStuInf{
public:
    AddStuInf();//构造函数
    void Add();
    friend class UpdateStuInf;
private:
    int N;//学生总人数
};

//初始化
AddStuInf::AddStuInf()
{
    N = 0;
}
//添加学生信息
void AddStuInf::Add()
{
    string num,name,address;//学号，姓名，政治面貌，家庭住址；
    int i,sex,politic,select;
    float goal;//c++期末成绩
    bool flags;//用于标识输入的学号是否已经存在
    
    cout<<"  ★请输入学生信息★\n";
    do{
        cout<<"        ◆请输入学号(字符串):";
        do{
            cin>>num;
            
            flags = false;
            
            for(i=0;i<count;i++)
            {
                if(Data[i].data[0]==num)//该学号已经存在
                {
                    flags = true;
                    break;
                }
            }

            if(flags==true)
            {
                cout<<"        ◆(该学号已经存在，请重新输入一个学号!)\n"<<endl;
                cout<<"        ◆请输入学号:";
            }
        }while(flags==true);


        cout<<"        ◆请输入姓名(字符串):";
        cin>>name;
        cout<<"        ◆性别"<<endl;
        cout<<"              ------------"<<endl;
        cout<<"             |---1:男生---|"<<endl;
        cout<<"             |---0:男生---|"<<endl;
        cout<<"              ------------"<<endl;
        cout<<"        ◆请输入性别(整数):";

        cin>>sex;

        if(cin.fail())//异常处理
        {
            cout<<"输入数据非法!";
            exit(0);
        }
        switch(sex)
        {
        case 1:
            Data[count].data[2] = "男生";
            break;
        case 0:
            Data[count].data[2] = "女生";
            break;
        default:
            Data[count].data[2] = "男生";
            break;
        }
        cout<<"        ◆政治面貌"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"             |---0:共青团员---|"<<endl;
        cout<<"             |---1:预备党员---|"<<endl;
        cout<<"             |---2:党    员---|"<<endl;
        cout<<"             |---3:群    众---|"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"        ◆请输入政治面貌(整数):";
        cin>>politic;
         if(cin.fail())//异常处理
        {
            cout<<"输入数据非法!";
            exit(0);
        }
        switch(politic)
        {
        case 0:
            Data[count].data[3] = "共青团员";
            break;
        case 1:
            Data[count].data[3] = "预备党员";
            break;
        case 2:
            Data[count].data[3] = "党员";
            break;
        case 3:
            Data[count].data[3] = "群众";
            break;
        default:
            Data[count].data[3] = "共青团员";
            break;
        }
        cout<<"        ◆请输入家庭住址(字符串):";
        cin>>address;
        cout<<"        ◆请输入成绩(浮点数):";
        cin>>goal;

        Data[count].data[0] = num;
        Data[count].data[1] = name;
        Data[count].data[4] = address;
        Data[count].goal = goal;
        count++;//学生人数自增
        N++;
        cout<<endl;
    
        cout<<"        ◆接下来的操作"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"             |---1:继续添加---|"<<endl;
        cout<<"             |---0:退----出---|"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"        ◆请输入接下来的操作:";
        cin>>select;
    }while(select==1);
    cout<<"  ★学生信息输入完毕★\n";
    cout<<endl;
}




//删除学生信息
class DeleteStuInf{
public:
    DeleteStuInf();//构造函数
    void Dele();
    friend  class UpdateStuInf;
};

//初始化
DeleteStuInf::DeleteStuInf()
{
}
//删除学生信息
void DeleteStuInf::Dele()
{
    int i,j,conti;
    string num;
    bool flags;
    cout<<"  ★删除学生信息★\n";
    do{
        cout<<"        ◆请输入要删除的学生的学号(字符串):";
        cin>>num;
        flags = false;
        for(i=0;i<count;i++)
        {
            if(Data[i].data[0]==num)
            {
                for(j=i+1;j<count;j++)
                {
                    Data[j-1] = Data[j];
                }
                count--;//学生人数-1
                flags = true;
                break;

            }
        }
        if(flags==false)
        {
            cout<<"        ◆学号为["<<num<<"]的学生不存在!"<<endl;
        }else cout<<"        ◆学号为["<<num<<"]的学生信息删除成功!"<<endl;

        cout<<endl;
        cout<<"        ◆接下来的操作"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"             |---1:继续删除---|"<<endl;
        cout<<"             |---0:退----出---|"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"        ◆请输入接下来的操作:";
        cin>>conti;
    }while(conti==1);
    cout<<"  ★删除学生信息完成★\n";
    cout<<endl;
}

//修改学生信息
class UpdateStuInf{
public:
    UpdateStuInf();//构造函数
    void Update();
    DeleteStuInf DeleStu;
    AddStuInf AddStu;
    int select;
};

//初始化
UpdateStuInf::UpdateStuInf()
{
    select = 0;
}
//修改学生信息
void UpdateStuInf::Update()
{
    string num,name,address;//学号，姓名，政治面貌，家庭住址；
    int i,sex,politic,conti,con;
    float goal;//c++期末成绩
    bool flags;//用于标识输入的学号是否已经存在
    
    cout<<"  ★修改学生信息★\n";
    do{
        cout<<"        ◆接下来的操作"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"             |---0:添    加---|"<<endl;
        cout<<"             |---1:删    除---|"<<endl;
        cout<<"             |---2:更    改---|"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"        ◆请输入接下来的操作:";
        cin>>select;
        switch(select)
        {
        case 0:
            AddStu.Add();
            break;
        case 1:
            DeleStu.Dele();
            break;
        default:
            do{
                cout<<"        ◆请输入要修改学生的学号(字符串):";
                cin>>num;//输入学号
                    
                flags = false;
                for(i=0;i<count;i++)
                {
                    if(Data[i].data[0]==num)//该学号存在,进行修改(学号不可修改)
                    {
                        cout<<"        ◆请输入姓名(字符串):";
                        cin>>name;
                        cout<<"        ◆性别"<<endl;
                        cout<<"              ------------"<<endl;
                        cout<<"             |---1:男生---|"<<endl;
                        cout<<"             |---0:男生---|"<<endl;
                        cout<<"              ------------"<<endl;
                        cout<<"        ◆请输入性别(整数):";
                        cin>>sex;
                        if(cin.fail())//异常处理
                        {
                            cout<<"输入数据非法!";
                            exit(0);
                        }
                        switch(sex)
                        {
                        case 1:
                            Data[i].data[2] = "男生";
                            break;
                        case 0:
                            Data[i].data[2] = "女生";
                            break;
                        default:
                            Data[i].data[2] = "男生";
                            break;
                        }
                        cout<<"        ◆政治面貌"<<endl;
                        cout<<"              ----------------"<<endl;
                        cout<<"             |---0:共青团员---|"<<endl;
                        cout<<"             |---1:预备党员---|"<<endl;
                        cout<<"             |---2:党    员---|"<<endl;
                        cout<<"             |---3:群    众---|"<<endl;
                        cout<<"              ----------------"<<endl;
                        cout<<"        ◆请输入政治面貌(整数):";
                        cin>>politic;
                        if(cin.fail())//异常处理
                        {
                            cout<<"输入数据非法!";
                            exit(0);
                        }
                        switch(politic)
                        {
                        case 0:
                            Data[i].data[3] = "共青团员";
                            break;
                        case 1:
                            Data[i].data[3] = "预备党员";
                            break;
                        case 2:
                            Data[i].data[3] = "党员";
                            break;
                        case 3:
                            Data[i].data[3] = "群众";
                            break;
                        default:
                            Data[i].data[3] = "共青团员";
                            break;
                        }
                        cout<<"        ◆请输入家庭住址(字符串):";
                        cin>>address;
                        cout<<"        ◆请输入成绩(浮点数):";
                        cin>>goal;
        
                        Data[i].data[1] = name;
                        Data[i].data[4] = address;
                        Data[i].goal = goal;

                        cout<<"        ◆学号为["<<num<<"]信息修改成功!";

                        flags = true;
                        break;
                    }
                }

                if(flags==false)
                {
                    cout<<"        ◆学号["<<num<<"]不存在!"<<endl;
                }

                cout<<endl;
                cout<<"        ◆接下来的操作"<<endl;
                cout<<"              ----------------"<<endl;
                cout<<"             |---1:继续更新---|"<<endl;
                cout<<"             |---0:退    出---|"<<endl;
                cout<<"              ----------------"<<endl;
                cout<<"        ◆请输入接下来的操作:";
                cin>>conti;
            }while(conti==1);
            break;
        }
        cout<<endl;
        cout<<"        ◆接下来的操作"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"             |---1:继续修改---|"<<endl;
        cout<<"             |---0:退    出---|"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"        ◆请输入接下来的操作:";
        cin>>con;
    }while(con==1);

    cout<<"  ★学生信息修改完毕★\n";
    cout<<endl;
}

//查看学生信息(基类)
class LookInf{
public:
    virtual void Look();//虚函数
};
 void LookInf::Look()
{
    int i;
    cout<<"学号\t姓名\t性别\t政治面貌\t家庭住址\t成绩"<<endl;
    for(i=0;i<count;i++)
    {
        cout<<Data[i].data[0]<<"\t"<<Data[i].data[1]<<"\t"<<Data[i].data[2]<<"\t";
        cout<<Data[i].data[3]<<"\t\t"<<Data[i].data[4]<<"\t\t"<<Data[i].goal<<endl;
    }
    cout<<" ★所有信息已经全部显示★"<<endl;
    cout<<endl;
}
//查看学生信息
class LookStuInf:public LookInf{
public:
    LookStuInf(){};//构造函数
    void Look();
};

//查看学生信息
void LookStuInf::Look()
{

    int i,select,conti;//选择
    string num;
    bool flags;
    cout<<"  ★查看学生信息★\n";
    LookInf look;

    do{
        cout<<"        ◆接下来的操作"<<endl;
        cout<<"              --------------------------"<<endl;
        cout<<"             |---1:查看全部学生信息-----|"<<endl;
        cout<<"             |---0:查看某个学号的信息---|"<<endl;
        cout<<"              --------------------------"<<endl;
        cout<<"        ◆请输入接下来的操作:";
        cin>>select;
        cout<<endl;
        if(cin.fail())//异常处理
        {
            cout<<"输入数据非法!";
            exit(0);
        }
        switch(select)
        {
        case 1:

            look.Look();
            break;
        case 0:
            cout<<"        ◆请输入你要查询学生的学号:";
            cin>>num;
            cout<<"学号\t姓名\t性别\t政治面貌\t家庭住址\t成绩"<<endl;
            flags = false;
            for(i=0;i<count;i++)
            {
                if(Data[i].data[0]==num)
                {
                    cout<<Data[i].data[0]<<"\t"<<Data[i].data[1]<<"\t"<<Data[i].data[2]<<"\t";
                    cout<<Data[i].data[3]<<"\t\t"<<Data[i].data[4]<<"\t\t"<<Data[i].goal<<endl;
                    flags = true;
                    cout<<endl;
                    cout<<" ★学号为["<<Data[i].data[0]<<"]的学生信息已经显示★"<<endl;
                    break;
                }

            }

            if(flags==false)//此学号不存在
            {
                cout<<"        ◆学号["<<num<<"]不存在!"<<endl;
            }
        }
        cout<<endl;
        cout<<"        ◆接下来的操作"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"             |---1:继续查询---|"<<endl;
        cout<<"             |---0:退    出---|"<<endl;
        cout<<"              ----------------"<<endl;
        cout<<"        ◆请输入接下来的操作:";
        cin>>conti;
    }while(conti==1);
}

class Sort_Goal{
public:
    Sort_Goal(){};//构造函数
    friend void Sort(Sort_Goal &);//友元函数
};

//学生成绩进行排序
void Sort(Sort_Goal &t)
{
    cout<<"  ★学生c++课程成绩进行排序★\n";
    int i,j,select;
    cout<<"        ◆接下来的操作"<<endl;
    cout<<"              ----------------"<<endl;
    cout<<"             |---1:降序排序---|"<<endl;
    cout<<"             |---0:升序排序---|"<<endl;
    cout<<"              ----------------"<<endl;
    cout<<"        ◆请输入接下来的操作:";
    cin>>select;
    if(cin.fail())//异常处理
    {
        cout<<"输入数据非法!";
        exit(0);
    }
    Student temp;
    for(i=0;i<count-1;i++){
        for(j=0;j<count-1-i;j++){
            if(select==1){//降序
                if(Data[j].goal<Data[j+1].goal){
                
                    temp = Data[j];
                    Data[j] = Data[j+1];
                    Data[j+1] = temp;
                }
            }else{//升序
                if(Data[j].goal>Data[j+1].goal){
                    Student temp;
                    temp = Data[j];
                    Data[j] = Data[j+1];
                    Data[j+1] = temp;
                }
            }
        }
    }

    cout<<"学号\t姓名\t性别\t政治面貌\t家庭住址\t成绩"<<endl;
            for(i=0;i<count;i++)
            {
                cout<<Data[i].data[0]<<"\t"<<Data[i].data[1]<<"\t"<<Data[i].data[2]<<"\t";
                cout<<Data[i].data[3]<<"\t\t"<<Data[i].data[4]<<"\t\t"<<Data[i].goal<<endl;
            }
            cout<<" ★学生c++课程成绩进行排序后信息已经全部显示★"<<endl;

}



int main()
{
    AddStuInf A;
    LookStuInf B;
    UpdateStuInf C;
    DeleteStuInf D;
    Sort_Goal E;
    int n;
    while(1){
        cout<<"                                  学生信息管理系统"<<endl;
        cout<<"                       ---------------------------------"<<endl;
        cout<<"                      |         ";cout<<"1.增加学生记录～";cout<<"        |"<<endl;
        cout<<"                      |         ";cout<<"2.查看学生记录～";cout<<"        |"<<endl;
        cout<<"                      |         ";cout<<"3.修改学生记录～";cout<<"        |"<<endl;
        cout<<"                      |         ";cout<<"4.删除学生记录～";cout<<"        |"<<endl;
        cout<<"                      |         ";cout<<"5.学生成绩排序～";cout<<"        |"<<endl;
        cout<<"                       ---------------------------------\n\n"<<endl;
        cout<<" ☆请选择：\n"<<endl;
        cin>>n;
        cout<<"\n";
        if(n==0)break;
        switch(n)
        {
        case 1:
            A.Add();
            break;
        case 2:
            B.Look();
            break;
        case 3:
            C.Update();
            break;
        case 4:
            D.Dele();
            break;
        case 5:
            Sort(E);
            break;
        default:
            break;
        }
    }
    return 0;
}