Problem C: 选举班干部了！-优快云博客

本文介绍了一个简单的C++程序设计案例，通过创建Student和StudentCadre两个类来模拟班级竞选过程。程序实现了学生信息的输入、输出及销毁等功能，并通过样例展示了程序运行的实际效果。

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Description

新学期伊始，某班要通过竞争上岗方式竞选班干部。包括班长、团支书等。现在需要你来设计2个类Student和StudentCadre来模拟这一过程。

1.Student类是学生类，包括

（1）属性：string name——姓名。bool sex——性别。int grade——年级。Student *next——指向下一个学生指针。

（2）方法：

构造函数Student(string _name, bool _sex, int _grade)——初始化一个对象。注意：其中的next初始化为NULL。
析构函数。
void showInfo()——输出一个学生的信息。next除外。
Student* getNext()——获得next指针。
void setNext(Student*)——设置next指针指向对象。

2. StudentCadre类是Student类的派生类，包括：

（1）属性：string position——表示竞聘岗位。

（2）方法：

StudentCadre(string _name, bool _sex, int _grade, string pos)——构造函数，初始化各种属性。
析构函数。
void showInfo()——显示信息。

构造函数和析构函数都有输出，具体见样例。

Input

输入有多行。

第1行有4部分：姓名、性别（0或1）、年级（整数）和岗位。

第2行是一个正整数N，表示有N个学生支持该人竞聘相应岗位。之后有N行，每行有3个部分，分别是一个学生的姓名、性别和年级。

Output

见样例。

Sample Input

Tom 0 2015 Monitor3Jack 1 2015Mary 0 2015Sherry 1 2015

Sample Output

A student named by Tom is created!A student cadre with position Monitor is created.A student named by Jack is created!A student named by Mary is created!A student named by Sherry is created!name = Tom, sex = 0, grade = 2015; position = Monitor.name = Jack, sex = 1, grade = 2015;name = Mary, sex = 0, grade = 2015;name = Sherry, sex = 1, grade = 2015;A student named by Tom is erased.A student named by Jack is erased.A student named by Mary is erased.A student named by Sherry is erased.

HINT

string类是C++提供的类，在头文件string中，可以用#include <string>来使用这个类。该类的对象可以直接利用赋值运算符（=）进行复制，也可以直接利用cout输出，或利用cin输入。

Append Code

append.cc,

#include <iostream>
#include <iomanip>
#include <string>

using namespace std;
class Student
{
protected:
    string name;
    bool sex;
    int grade;
    Student * next;
public:
    Student(string _name,bool _sex,int _grade)
    {
        name = _name;
        sex = _sex;
        grade = _grade;
        next = NULL;
        cout << "A student named by "<< name <<" is created!" << endl;
    }
    void showInfo()
    {
        cout << "name = "<< name <<", sex = "<< sex <<", grade = "<< grade <<";" ;
    }
    Student* getNext()
    {
        return next;
    }
    void setNext(Student* s)
    {
        next = s;
    }

    ~Student()
    {
         cout << "A student named by "<< name <<" is erased." << endl;
    }
};
class StudentCadre:public Student
{
private:
    string position;
public:
    StudentCadre(string _name, bool _sex, int _grade, string pos):Student(_name,_sex,_grade)
    {
        position = pos;
        cout << "A student cadre with position "<<position<<" is created." << endl;
    }
    void showInfo()
    {
        cout << "name = "<< name <<", sex = "<< sex <<", grade = "<< grade <<"; position = "<< position <<"." ;
    }
    ~StudentCadre()
    {

    }
};
int main()
{
    int num;
    string name, position;
    bool sex;
    int grade;
    Student *header, *student, *curStudent;

    cin>>name>>sex>>grade>>position;
    header = new StudentCadre(name, sex, grade,position);
    curStudent = header;
    cin>>num;
    for (int i = 0; i < num; i++)
    {
        cin>>name>>sex>>grade;
        student = new Student(name, sex, grade);
        curStudent -> setNext(student);
        curStudent = curStudent -> getNext();
    }
    ((StudentCadre*)header) -> showInfo();
    cout<<endl;
    curStudent = header;
    while (curStudent -> getNext() != NULL)
    {
        curStudent = curStudent -> getNext();
        curStudent->showInfo();
        cout<<endl;
    }

    curStudent = header;
    while (curStudent != NULL)
    {
        student = curStudent;
        curStudent = curStudent -> getNext();
        delete student;
    }
    return 0;
}