编程实训小组课题——学生成绩管理系统

Question

要求
1.显示所有学生信（学号，姓名）
2.查询个人成绩（语数外）
3.修改成绩（学号，课程）
4.按平均分排序显示（升序）
5.按总分排序（升序）
注：上1到5需单独列出代码

Answer 1

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#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

// 定义学生信息结构体
struct Student {
    string id;      // 学号
    string name;    // 姓名
    float chinese;  // 语文成绩
    float math;     // 数学成绩
    float english;  // 英语成绩
    float total;    // 总分
    float average;  // 平均分
};

// 显示所有学生信息
void display_all(Student *students, int count) {
    cout << "学号\t姓名\n";
    for (int i = 0; i < count; i++) {
        cout << students[i].id << "\t" << students[i].name << endl;
    }
}

// 查询个人成绩
void query_score(Student *students, int count) {
    string id;
    cout << "请输入学生学号：";
    cin >> id;
    for (int i = 0; i < count; i++) {
        if (students[i].id == id) {
            cout << "学号\t语文\t数学\t英语\n";
            cout << students[i].id << "\t" << students[i].chinese << "\t" << students[i].math << "\t" << students[i].english << endl;
            return;
        }
    }
    cout << "未找到该学生的成绩记录。\n";
}

// 修改成绩
void modify_score(Student *students, int count) {
    string id;
    string course;
    float score;
    cout << "请输入学生学号：";
    cin >> id;
    cout << "请输入要修改的课程（chinese/math/english）：";
    cin >> course;
    cout << "请输入新的成绩：";
    cin >> score;
    for (int i = 0; i < count; i++) {
        if (students[i].id == id) {
            if (course == "chinese") {
                students[i].chinese = score;
            } else if (course == "math") {
                students[i].math = score;
            } else if (course == "english") {
                students[i].english = score;
            } else {
                cout << "无效的课程名称。\n";
                return;
            }
            students[i].total = students[i].chinese + students[i].math + students[i].english;
            students[i].average = students[i].total / 3;
            cout << "成绩修改成功。\n";
            return;
        }
    }
    cout << "未找到该学生的成绩记录。\n";
}

// 按平均分排序显示
bool compare_average(const Student &s1, const Student &s2) {
    return s1.average < s2.average;
}

void sort_by_average(Student *students, int count) {
    sort(students, students + count, compare_average);
    cout << "学号\t姓名\t平均分\n";
    for (int i = 0; i < count; i++) {
        cout << students[i].id << "\t" << students[i].name << "\t" << students[i].average << endl;
    }
}

// 按总分排序显示
bool compare_total(const Student &s1, const Student &s2) {
    return s1.total < s2.total;
}

void sort_by_total(Student *students, int count) {
    sort(students, students + count, compare_total);
    cout << "学号\t姓名\t总分\n";
    for (int i = 0; i < count; i++) {
        cout << students[i].id << "\t" << students[i].name << "\t" << students[i].total << endl;
    }
}

int main() {
    int n;
    cout << "请输入学生数量：";
    cin >> n;
    Student *students = new Student[n];
    for (int i = 0; i < n; i++) {
        cout << "请输入第" << i + 1 << "个学生的信息（学号、姓名、语文成绩、数学成绩、英语成绩）：";
        cin >> students[i].id >> students[i].name >> students[i].chinese >> students[i].math >> students[i].english;
        students[i].total = students[i].chinese + students[i].math + students[i].english;
        students[i].average = students[i].total / 3;
    }

    int choice;
    while (true) {
        cout << "请选择操作：\n";
        cout << "1. 显示所有学生信息\n";
        cout << "2. 查询个人成绩\n";
        cout << "3. 修改成绩\n";
        cout << "4. 按平均分排序显示\n";
        cout << "5. 按总分排序显示\n";
        cout << "6. 退出\n";
        cout << "请输入操作编号：";
        cin >> choice;
        switch (choice) {
            case 1:
                display_all(students, n);
                break;
            case 2:
                query_score(students, n);
                break;
            case 3:
                modify_score(students, n);
                break;
            case 4:
                sort_by_average(students, n);
                break;
            case 5:
                sort_by_total(students, n);
                break;
            case 6:
                cout << "谢谢使用！\n";
                return 0;
            default:
                cout << "无效的操作编号。\n";
                break;
        }
    }

    delete[] students;
    return 0;
}