学生管理系统

#include
#include//C++
//#include//C的老库函数库
#include
using namespace std;//以上库的命名空间，不在这个空间不能使用

class Student
{
private:
string s_id;
string s_name;
string s_sex;
int s_age;
public:
Student() 😒_age(0){}//无参构造函数
Student(const string&id,const string&name,const string&sex,int age):
s_id(id),s_name(name),s_sex(sex),s_age(age){}//参数列表形式的构造函数
~Student(){}
//读取或修改学生信息
string& Id() { return s_id; }
const string& Id()const { return s_id; }
string& Name() { return s_name; }
const string& Name()const { return s_name; }
string& Sex() { return s_sex; }
const string& Sex()const { return s_sex; }
int& Age() { return s_age; }
const int& Age()const { return s_age; }
//在学生类里使用输出流“<<”重载输出学生信息
ostream& operator<<(ostream& out)const
{
out << s_id << “” << s_name << “” << s_sex << “” << s_age ;
return out;
}
};
class Course//课程类型
{
private:
string c_id;
string c_name;
string c_techter;
int credit;
};
class Score
{
private:
string s_id;
string c_id;
float result;
};
class StudManage
{
std::vector studdata;//创建一个存储学生的容器
typename std::vector::iterator cur;//创建一个当前迭代器：在查询过程中当查询到就让迭代器指向那个位置
//typename 告诉编译器 iterator是vector的一个类型，是一个面向对象型的指针
public:
StudManage() {}
~StudManage(){}
void Add_Student(const Student& s)//添加学生
{
studdata.push_back(s);//在尾部添加学生
} /*
//使用迭代器打印学生信息
void Print_Student()
{
typename std::vector::const_iterator it = studdata.begin();//创建常性迭代器指向容器头部位置
for (; it != studdata.end(); ++it)
{
cout << it->Id() << “” << it->Name() << “” << it->Sex() << “” << it->Age() << endl;
}
cout << endl;
}

//使用 auto 打印学生信息 auto可以获取容器中的对象 ,
void Print_Student()
{
    
    for(auto x:studdata)//但每获取一个对象就需要拷贝构造一个对象
    //for(auto cosnt x: studdata)//使用引用就不用构造对象了
    {
        cout << x.Id() << "" << x.Name() << "" << x.Sex() << "" << x.Age() << endl;
    }
    cout << endl;
}*/
//最优输出方案
void Print_Student()
{
    
    for (auto const&x:studdata)
    {
        x << cout;
        cout << endl;
    }
    cout << endl;
}

//使用迭代器查询学生
bool Find_Id(const string& id)
{
    bool res = false;
    cur = studdata.begin();
    for (; cur != studdata.end(); ++cur)
    {
        if(cur->Id() == id)
        {
            cout << "查询成功" << endl;
            res = true;
            break;

        }
    }
    return res;
}
bool Del_Student_Id(const string& id)
{
    bool res = Find_Id(id);
    if (res)
    {
        studdata.erase(cur);//删除当前迭代器指向位置信息
        cur = studdata.end();
    }
    return res;
}
bool Updata_Student_Id(const string& id,string&name,string&sex,int age)
{
    bool res = Find_Id(id);
    if (res)
    {
        cur->Name() = name;
        cur->Sex() = sex;
        cur->Age() = age;
    }
    return res;
}

};
void Add(StudManage& studMan)
{
string id, name, sex;
int age;

char ch;
do
{
    cout << "请输入学生：" << endl;
    cin >> id >> name >> sex >> age;
    Student s(id, name, sex, age);
    studMan.Add_Student(s);
    cout << "是否继续（N/Y)" << endl;
    cin >> ch;
} while (ch == 'y' || ch == 'Y');
cout << "添加完毕" << endl;

}
bool Find_Student(StudManage& studMan)
{
string id;
cout << “intput student id” << endl;
cin >> id;
return studMan.Find_Id(id);
}
bool Del_Student(StudManage& studMan)
{
string id;
cout << “intput student id” << endl;
cin >> id;
return studMan.Del_Student_Id(id);
}
int MenuStudent()
{
int pos=0;
cout << “" << endl;
cout << “1Add 2Print” << endl;
cout << “*3Find 4Del *” << endl;
cout << “*5updata 0退出 *” << endl;
cout << "” << endl;
cout << “* 请选择 *” << endl;
cin >> pos;
return pos;
}
bool Updata_Student(StudManage&studMan )
{
string name, sex,id;
int age;
cout << “请输入需要更改的学生信息” << endl;
cin >> name >> sex >> age;
return studMan.Updata_Student_Id(id, name, sex, age);
}
int main()
{

StudManage studMan;
int pos = 0;
do
{
    pos = MenuStudent();
    switch (pos)
    {
    case 0:cout << "退出" << endl;
    case 1:Add(studMan); break;
    case 2:studMan.Print_Student(); break;
    case 3:
        if (Find_Student(studMan))
        {
            cout << "查询成功" << endl;
        }
        else
        {
            cout << "查询失败" << endl;
        }; break;
    case 4:
        if (Del_Student(studMan))
        {
            cout << "删除成功" << endl;
        }
        else
        {
            cout << "删除失败" << endl;
        }; break;
    case 5:
        if (Updata_Student(studMan))
        {
            cout << "修改成功" << endl;
        }
        else
        {
            cout << "修改失败" << endl;
        }; break;
    default:
        cout << "选择错误！" << endl;
    }
} while (pos != 0);


return 0;

}