面向对象程序设计2018上机题（5）

/*题目：基于链表的学生信息管理系统
要求：
    （1）插入节点：输入学生信息后，生成节点并插入链表中；
    （2）删除节点：根据给定的学生姓名或学号删除该学生节点；
    （3）查找节点：根据给定的学生姓名或学号查找学生信息，并显示出来；
  （4）查找并显示总成绩最高和最低的学生信息；
     （5）统计链表中的学生人数；
  （6）（时间允许时选做） 对链表节点按总成绩从高到低排序。
   注：
   （1）每个学生信息包括：姓名、学号、性别、出生年月日和3门课的成绩；
   （2）系统运行后，首先显示一个简易的菜单，基于菜单操作来完成上述功能；
   （3）链表的功能需要编程实现。*/

#include
#include
#include
using namespace std;

class Date
{
private:
	unsigned short int year;
	unsigned short int month;
	unsigned short int day;
public:
	bool CheckDate(int y, int m, int d);
	friend istream &operator>>(istream &is, Date &d);
	friend ostream &operator<<(ostream &os, const Date &d);
	Date& operator=(const Date&d);
};
bool Date::CheckDate(int y, int m, int d)
{
	int n;//最大天数
	if (m<1 || m>12) return false;
	if (d<1) return false;
	n = 31;
	switch (m)
	{
	case 2:
		if (y % 4 == 0 && y % 100 || y % 400 == 0)//判断是否是闰年
			n = 29;
		else
			n = 28;
		break;
	case 4:
	case 6:
	case 9:
	case 11:
		n = 30;
		break;
	}
	if (d > n) return false;
	return true;
}
istream &operator>>(istream &is, Date &d)
{
	is >>d.year >> d.month >> d.day;
	while (d.CheckDate(d.year, d.month, d.day) == false) {
		cout << "出生年月日输入错误！请重新输入：" << endl;
		is >> d.year >> d.month >> d.day;
	}
	return is;
}
ostream &operator<<(ostream &os, const Date &d)
{
	os << d.year << "/" << d.month << "/" << d.day ;
	return os;
}
Date& Date::operator=(const Date&d)
{
	year = d.year;
	month = d.month;
	day = d.day;
	return *this;
}
/*------------------------------------------------------------*/
class Student
{
private:
	string name;
	string number;
	char gender;
	Date date;
	float score1, score2, score3;
	float sum;
public:
	Student *next;
	Student();
	~Student();
	void operator=(const Student& stu);
	void input();
	void disp();
	friend class LinkList;
};
Student::Student()
{
	next = nullptr;
}
Student::~Student(){}
void Student::operator=(const Student& stu)
{
	name = stu.name;
	number = stu.number;
	gender = stu.gender;
	date = stu.date;
	score1 = stu.score1;
	score2 = stu.score2;
	score3 = stu.score3;
	sum = stu.sum;
}
void Student::input()
{
	cout << "请依次输入姓名，学号，性别（M（男）/F（女））,出生年月日：" << endl;
	cin >> name >> number >> gender >> date;
	while (gender != 'M' && gender != 'F' ) {
		cout << "性别输入错误！请重新输入：" << endl;
		cin >> gender;
	}
	cout << "请输入三门课程成绩：";
	cin >> score1 >> score2 >> score3;
	sum = score1 + score2 + score3;
}
void Student::disp()
{
	cout << "|*------------------------------------------------------*|" << endl;
	cout << "姓名：" << name << '\t' << "学号：" << number << endl;
	cout << "性别：" << gender << '\t' << '\t' << "出生年月日：" << date << endl;
	cout << "三门课程成绩：" << score1 << '\t' << score2 << '\t' << score3 << endl;
	cout << "总分：" << sum << endl;
	cout << "|*------------------------------------------------------*|" << endl;
}
class LinkList
{
private:
	Student * head;
	Student * last;
	static float count;
public:
	LinkList();
	~LinkList();
	void Append(Student stu);
	void Delete(string s);
	void Find(string s);
	void Extrnum();
	Student* Max(Student *ptr);
	void Sort();
	void Count();
};
float LinkList::count = 0;
LinkList::LinkList()
{
	head = new Student;
	last = head;
	last->next = nullptr;
}
LinkList::~LinkList()
{
	delete head;
}
void LinkList::Append(Student stu)
{
	cout << "插入节点！" << endl;
	Student *pnew = new Student;
	*pnew = stu;
	pnew->next = nullptr;
	last->next = pnew;
	last = last->next;
	LinkList::count ++;
}
void LinkList::Delete(string s)
{
	char flag = 'N';
	Student *temp = head;
	while (temp != last) {
		if (temp->next->name == s || temp->next->number == s) {
			temp->next->disp();
			cout << "是否确认删除该学生信息？（Y/N）：";
			cin >> flag;
			while (flag != 'Y' && flag != 'N') {
				cout << "请输入正确指令：";
				cin >> flag;
			}
			if (flag == 'Y') {
				cout << "删除节点！" << endl;
				Student *del = temp->next;
				temp->next = temp->next->next;
				del->~Student();
				LinkList::count--;
			}
		}
		temp = temp->next;
	}
}
void LinkList::Find(string s)
{
	int flag = 0;
	Student *pfind = head->next;
	while (pfind != nullptr) {
		if (pfind->name == s || pfind->number == s) {
			flag++;
			cout << "符合学生信息" << flag << "：" << endl;
			pfind->disp();
		}
		pfind = pfind->next;
	}
	if (flag == 0) cout << "查无此人！" << endl;
}
void LinkList::Extrnum()
{
	cout << "查找并显示总成绩最高和最低的学生信息：" << endl;
	float min_sum = 1000.0f;
	float max_sum = 0.0f;
	Student* temp = head->next;
	/*可能存在最高或最低成绩相同的学生，分两次遍历*/
	while (temp != nullptr) {
		if (temp->sum < min_sum) min_sum = temp->sum;
		else if (temp->sum > max_sum) max_sum = temp->sum;
		temp = temp->next;
	}
	temp = head->next;
	while (temp != nullptr) {
		if (temp->sum == min_sum) {
			cout << "总成绩最低学生信息：" << endl;
			temp->disp();
		}
		else if (temp->sum == max_sum) {
			cout << "总成绩最高学生信息：" << endl;
			temp->disp();
		}
		temp = temp->next;
	}
}
Student* LinkList::Max(Student *ptr)
{
	Student *p = ptr;
	Student *pmax = p;
	while (p != nullptr) {
		if (p->sum > pmax->sum) {
			pmax = p;
		}
		p = p->next;
	}
	return pmax;
}
void LinkList::Sort()
{
	Student *p = head->next;
	Student *r = nullptr;
	while (p != nullptr) {
		r = Max(p);
		Student stu = *p;
		*p = *r;
		*r = stu;
		p = p->next;
	}
	p = head->next;
	cout << "排序后链表：" << endl;
	while (p != nullptr) {
		p->disp();
		p = p->next;
	}
}
void LinkList::Count()
{
	cout << "链表中学生人数：" << LinkList::count << endl;
}

int main()
{
	LinkList llist;
	int order = 0;
	string s;
	Student stu;
	while (order != 6) {
		cout << "|*------------------学生信息管理系统--------------------*|" << endl;
		cout << "|                    输入0：插入节点                     |" << endl;
		cout << "|                    输入1：删除节点                     |" << endl;
		cout << "|                    输入2：查找节点                     |" << endl;
		cout << "|       输入3：查找并显示总成绩最高和最低的学生信息      |" << endl;
		cout << "|              输入4：统计链表中的学生人数               |" << endl;
		cout << "|          输入5：对链表节点按总成绩从高到低排序         |" << endl;
		cout << "|                    输入6：退出系统                     |" << endl;
		cout << "|*------------------------------------------------------*|" << endl;
		cin >> order;
		switch (order) {
		case 0: 
			stu.input();
			llist.Append(stu);
			break; 
		case 1: 
			cout << "请输入要删除的学生姓名或学号：" << endl;
			cin >> s;
			llist.Delete(s);
			break; 
		case 2: 
			cout << "请输入要查找的学生姓名或学号：" << endl;
			cin >> s;
			llist.Find(s);
			break; 
		case 3: 
			llist.Extrnum();
			break; 
		case 4: 
			llist.Count();
			break; 
		case 5: 
			llist.Sort();
			break; 
		case 6:
			cout << "退出系统！" << endl;
			break;
		default:
			cout << "输入错误信息！请重新输入。" << endl;
			cin >> order;
			break;
		}
	}
	system("pause");
	return 0;
}