学生管理系统

#include<iostream>
#include<fstream>
#include<algorithm>
#define FILENAME "student.txt"
using namespace std;
struct Student {
	int m_id;
	string m_name;
	string m_major;
	string m_sex;
	int m_age;
	Student *next;
};
void menu() {
	cout << "学生信息管理系统" << endl;
	cout << "   1.录入" << endl;
	cout << "   2.插入" << endl;
	cout << "   3.删除" << endl;
	cout << "   4.输出" << endl;
	cout << "   5.查找" << endl;
	cout << "   6.清空" << endl;
	cout << "   7.排序" << endl;
	cout << "   8.退出" << endl;
	cout << endl;
}
void clear() {
	system("pause");
	system("cls");
}
void create() {
	ofstream ofs;
	bool flag = true;
	int id;
	string name;
	string major;
	string sex;
	int age;
	while (flag) {
		cout << "请输入学生的学号；" << endl;
		cin >> id;
		cout << "请输入学生的姓名：" << endl;
		cin >> name;
		cout << "请输入学生的专业：" << endl;
		cin >> major;
		cout << "请输入学生的性别：" << endl;
		cin >> sex;
		cout << "请输入学生的的年龄" << endl;
		cin >> age;
		ofs.open(FILENAME, ios::app | ios::binary);
		ofs << id << endl << name << endl << major << endl << sex << endl << age << endl;
		ofs.close();
		cout << "是否继续录入学生信息：（0.取消 1.确定）" << endl;
		cin >> flag;
	}
	cout << "录入完成！" << endl;
	clear();
}
void save(Student *head) {
	ofstream ofs;
	Student *p = head;
	ofs.open(FILENAME, ios::trunc | ios::binary);
	while (p->next != nullptr) {
		p = p->next;
		ofs << p->m_id << endl << p->m_name << endl << p->m_major << endl << p->m_sex << endl << p->m_age << endl;
	}
}
Student* makeLinkList(Student *head) {
	ifstream ifs;
	ifs.open(FILENAME, ios::in | ios::binary);
	if (!ifs.is_open()) {
		cout << "文件打开失败" << endl;
		exit(0);
	}
	int id;
	string name;
	string major;
	string sex;
	int age;
	Student *p = head;
	while (ifs >> id && ifs >> name && ifs >> major && ifs >> sex && ifs >> age) {
		Student *newNode = new Student;
		newNode->m_id = id;
		newNode->m_name = name;
		newNode->m_major = major;
		newNode->m_sex = sex;
		newNode->m_age = age;
		p->next = newNode;
		p = newNode;
	}
	p->next = nullptr;
	ifs.close();
	return head;
}
void output(Student *head) {
	head = makeLinkList(head);
	Student *p = head;
	while (p->next != nullptr) {
		p = p->next;
		cout << "学生的学号：" << p->m_id << " "
		     << "学生的姓名：" << p->m_name << " "
		     << "学生的专业：" << p->m_major << " "
		     << "学生的性别；" << p->m_sex << " "
		     << "学生的年龄：" << p->m_age << " "
		     << endl;
	}
}
void insert(Student* head) {
	output(head);
	head = makeLinkList(head);
	Student *p = head;
	int id;
	string name;
	string major;
	string sex;
	int age;
	int pos, i = 0, j = 0;
	cout << "请输入要插入的位置在第几个后：" << endl;
	cin >> pos;
	while (p->next != nullptr) {
		p = p->next;
		j++;
	}
	p = head;
	if (pos > j || pos < 1) {
		cout << "您的输入不合法！" << endl;
		clear();
		return;
	}
	cout << "请输入学生的学号；" << endl;
	cin >> id;
	cout << "请输入学生的姓名：" << endl;
	cin >> name;
	cout << "请输入学生的专业：" << endl;
	cin >> major;
	cout << "请输入学生的性别：" << endl;
	cin >> sex;
	cout << "请输入学生的的年龄" << endl;
	cin >> age;
	while (p->next != nullptr) {
		p = p->next;
		i++;
		if (i == pos) {
			Student* newNode = new Student;
			newNode->next = p->next;
			p->next = newNode;
			newNode->m_id = id;
			newNode->m_name = name;
			newNode->m_major = major;
			newNode->m_sex = sex;
			newNode->m_age = age;
		}
	}
	p->next = nullptr;
	save(head);
	cout << "插入完成！" << endl;
	clear();
}
void _delete(Student *head) {
	output(head);
	head = makeLinkList(head);
	int pos, i = 0, j = 0;
	cout << "请输入要删除第几个学生:" << endl;
	cin >> pos;
	Student *p = head;
	while (p->next != nullptr) {
		p = p->next;
		j++;
	}
	if (pos > j || pos < 1) {
		cout << "您的输入不合法！" << endl;
		clear();
		return;
	}
	p = head;
	while (p->next != nullptr) {
		
		if (i == pos) {
			p->next = p->next->next;
			break;
		}
		p = p->next;
	}
	save(head);
	cout << "删除完成！" << endl;
	clear();
}
void find(Student *head) {
	head = makeLinkList(head);
	cout << "请输入要查询的学号：" << endl;
	int pos, flag = -1;
	cin >> pos;
	Student *p = head;
	while (p->next != nullptr) {
		p = p->next;
		if (p->m_id == pos) {
			cout << "已经查到了学号为：" << pos << " 的学生" << endl
			     << "学生的姓名：" << p->m_name << " "
			     << "学生的专业：" << p->m_major << " "
			     << "学生的性别；" << p->m_sex << " "
			     << "学生的年龄：" << p->m_age << " "
			     << endl;
			flag = 0;
			break;
		}
	}
	if (flag == -1)
		cout << "没有查到该学号的学生!" << endl;
	cout << "查询完成！" << endl;
	clear();
}
bool cmp(Student x, Student y) {
	return x.m_id < y.m_id;
}
void _sort(Student *head) {
	head = makeLinkList(head);
	vector<Student> tmpVector;
	Student *p = head;
	while (p->next != nullptr) {
		p = p->next;
		tmpVector.push_back(*p);
	}
	sort(tmpVector.begin(), tmpVector.end(), cmp);
	Student *newhead = new Student;
	Student *np = newhead;
	while (!tmpVector.empty()) {
		Student * newNode = new Student;
		np->next = newNode;
		np = newNode;
		Student tmp = *tmpVector.begin();
		tmpVector.erase(tmpVector.begin());
		newNode->m_age = tmp.m_age;
		newNode->m_id = tmp.m_id;
		newNode->m_major = tmp.m_major;
		newNode->m_name = tmp.m_major;
		newNode->m_sex = tmp.m_sex;
	}
	np->next = nullptr;
	save(newhead);
	cout << "排序完成！" << endl;
	clear();
}
void clean() {
	ofstream ofs;
	ofs.open(FILENAME, ios::trunc | ios::binary);
	cout << "清空完成!" << endl;
	clear();
}
int main() {
	int choose;
	Student *head = new Student;
	while (1) {
		menu();
		cout << "请输入选项:" << endl;
		cin >> choose;
		switch (choose) {
			case 1:
				create();
				break;
			case 2:
				insert(head);
				break;
			case 3:
				_delete(head);
				break;
			case 4:
				output(head);
				clear();
				break;
			case 5:
				find(head);
				break;
			case 6:
				clean();
				break;
			case 7:
				_sort(head);
				break;
			case 8:
				exit(0);
				break;
			default:
				system("cls");
				cout << "您的输入有误，请重新输入" << endl;
				system("pause");
				break;
		}
	}
	return 0;
}