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#include <iostream>
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#include <vector>
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#include <algorithm>
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#include <string>
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#include <limits>
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using namespace std;
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struct Student {
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string id;
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string name;
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vector<float> scores;
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float total;
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};
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// 输入学生信息
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// 添加总分计算函数
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void calculateTotal(Student& s) {
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s.total = s.scores[0] + s.scores[1] + s.scores[2];
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}
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// 修改输入学生信息函数
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// 新增学号输入函数
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void inputStudentId(Student& s) {
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while(true) {
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cout << "输入学号: ";
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cin >> s.id;
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if(s.id.find_first_not_of("0123456789") == string::npos) break;
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cout << "学号必须为纯数字，请重新输入！\n";
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cin.clear();
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cin.ignore(numeric_limits<streamsize>::max(), '\n');
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}
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}
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// 修改后的学生信息输入
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void inputStudentInfo(Student& s) {
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cout << "输入姓名: ";
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cin >> s.name;
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s.scores.resize(3);
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cout << "输入语文成绩: ";
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cin >> s.scores[0];
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cout << "输入数学成绩: ";
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cin >> s.scores[1];
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cout << "输入英语成绩: ";
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cin >> s.scores[2];
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calculateTotal(s);
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}
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// 前向声明printStudent函数
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void printStudent(const Student& s);
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// 学生管理系统类
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class StudentManager {
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private:
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vector<Student> students;
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public:
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// 添加学生（修复丢失的成员函数）
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void addStudent() {
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Student s;
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// 学号验证循环
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do {
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inputStudentId(s);
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auto exist = find_if(students.begin(), students.end(),
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[&](const Student& stu){ return stu.id == s.id; });
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if (exist == students.end()) break;
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cout << "学号已存在，请重新输入！\n";
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} while(true);
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// 输入其他信息
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inputStudentInfo(s);
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students.push_back(s);
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cout << "添加成功！\n";
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}
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// 显示全部学生（始终按学号排序）
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// 显示全部学生
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void displayAll() {
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if (students.empty()) {
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cout << "当前没有学生记录\n";
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return;
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}
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// 创建临时副本进行排序
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vector<Student> temp = students;
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sort(temp.begin(), temp.end(), [](const Student& a, const Student& b) {
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// 修改为升序排列：先比长度，短的在前；长度相同按字典序升序
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if (a.id.length() != b.id.length())
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return a.id.length() < b.id.length();
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return a.id < b.id;
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});
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for_each(temp.begin(), temp.end(), printStudent);
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}
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// 按总分排序（不修改原始数据）
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void sortByTotal() {
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if(students.empty()) {
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cout << "当前没有学生记录\n";
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return;
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}
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vector<Student> temp = students;
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sort(temp.begin(), temp.end(),
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[](const Student& a, const Student& b){ return a.total > b.total; });
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cout << "=== 总分排序结果 ===\n";
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for_each(temp.begin(), temp.end(), printStudent);
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}
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// 删除学生
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void deleteStudent(const string& id) {
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auto it = find_if(students.begin(), students.end(),
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[&](const Student& s){ return s.id == id; });
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if (it != students.end()) {
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students.erase(it);
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cout << "删除成功\n";
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} else {
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cout << "未找到该学生\n";
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}
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}
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// 修改学生信息
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// 修正修改学生信息逻辑
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// 修改学生信息
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void modifyStudent(const string& id) {
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auto it = find_if(students.begin(), students.end(),
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[&](const Student& s){ return s.id == id; });
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if (it != students.end()) {
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Student original = *it; // 保存完整原始数据
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// 输入学号并进行验证
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inputStudentId(*it);
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// 检查学号是否重复（排除自己）
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if (it->id != original.id) {
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auto conflict = find_if(students.begin(), students.end(),
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[&](const Student& s){ return s.id == it->id && &s != &(*it); });
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if (conflict != students.end()) {
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cout << "错误：学号已存在！\n";
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*it = original; // 恢复全部原始数据
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return;
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}
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}
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// 输入其他信息
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inputStudentInfo(*it);
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cout << "修改成功\n";
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} else {
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cout << "未找到该学生\n";
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}
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}
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// 新增查询学生函数
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void queryStudent(const string& id) {
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auto it = find_if(students.begin(), students.end(),
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[&](const Student& s){ return s.id == id; });
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if (it != students.end()) {
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printStudent(*it);
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} else {
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cout << "未找到学号为 " << id << " 的学生\n";
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}
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}
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};
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// 修改菜单界面
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void showMenu() {
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cout << "\n====== 学生成绩管理系统 ======\n"
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<< "1. 添加学生\n"
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<< "2. 显示所有学生\n"
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<< "3. 按总分排序\n"
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<< "4. 删除学生\n"
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<< "5. 修改学生信息\n"
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<< "6. 查询学生信息\n" // 新增菜单项
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<< "0. 退出\n"
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<< "=============================\n"
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<< "请选择操作: ";
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}
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int main() {
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StudentManager manager;
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int choice = -1; // 初始化为非0值
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string tmpId;
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do {
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showMenu();
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if (!(cin >> choice)) {
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cin.clear();
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cin.ignore(numeric_limits<streamsize>::max(), '\n');
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cout << "请输入数字选项！" << endl;
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choice = -1; // 重置为无效值
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continue;
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}
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cin.ignore(numeric_limits<streamsize>::max(), '\n'); // 统一处理换行符
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switch(choice) {
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case 1:
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manager.addStudent();
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break;
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case 2:
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manager.displayAll();
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break;
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case 3:
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manager.sortByTotal();
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break;
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case 4:
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cout << "输入要删除的学号: ";
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cin >> tmpId;
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manager.deleteStudent(tmpId);
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break;
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case 5:
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cout << "输入要修改的学号: ";
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cin >> tmpId;
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manager.modifyStudent(tmpId);
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break;
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case 6:
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cout << "输入要查询的学号: ";
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cin >> tmpId;
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manager.queryStudent(tmpId);
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break;
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case 0:
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cout << "感谢使用，再见！\n";
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break;
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default:
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cout << "无效输入，请重新选择！\n";
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// 删除此处的ignore，已在主循环统一处理
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}
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} while(choice != 0); // 只有当明确输入0时退出
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return 0;
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}
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// 后续补充printStudent的具体实现
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void printStudent(const Student& s) {
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cout << "学号: " << s.id
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<< "\t姓名: " << s.name
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<< "\t总分: " << s.total
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<< " (语文:" << s.scores[0]
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<< " 数学:" << s.scores[1]
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<< " 英语:" << s.scores[2] << ")\n";
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}
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