结构体数组读取文件信息失败，读取不了

Question

代码读取不了文件结构体数组读不了txt文件里的信息。希望有会的能帮忙改一下，不要用类与对象，指针这些因为还没学看不懂。谢谢！

#include <algorithm>
#include <fstream>
#include <iostream>
#include <string>
#include <cassert>
#include<vector>
using namespace std;
// 学生结构体
struct Student {
    string id; // 学号
    string name; // 姓名
    double chinese; // 语文成绩
    double math; // 数学成绩
    double english; // 英语成绩
    double average; // 考试成绩
    int rank; // 考试名次
    double peer_score; // 同学互评分
    double morality_score; // 品德成绩
    double teacher_score; // 任课教师评分
    double total_score; // 综合测评总分
    int total_rank; // 综合测评名次
};

const int MAX_STUDENT_NUM = 1000;
Student studentss[MAX_STUDENT_NUM]; // 学生数组
int student_num = 0; // 学生数
const string filePath2 = "information2.txt";

// 按照从大到小的顺序比较学生成绩，用于排序
bool compare_averages(const Student& s1, const Student& s2)
{
    return s1.average > s2.average;
}

// 按照从大到小的顺序比较学生总分，用于排序
bool compare_total_scores(const Student& s1, const Student& s2)
{
    return s1.total_score > s2.total_score;
}

void getline()
{
    int count = 0;
    char line[128];
    fstream information2_file;
    information2_file.open(filePath2, ios::in);
    while (!information2_file.eof())
    {
        information2_file.getline(line, sizeof(line));
        count++;
    }
    information2_file.close();
    student_num = count;
}
// 读入学生信息
void  read_students()
{
    ifstream information2_file; // 打开文件
    //    assert(fin.is_open());
    information2_file.open(filePath2, ios::in);
    int i = 0;
    while (i<student_num)
    {
        information2_file>>studentss[i].id >> studentss[i].name >> studentss[i].chinese >> studentss[i].math >> studentss[i].english >> studentss[i].peer_score >> studentss[i].morality_score >> studentss[i].teacher_score;
        i++;
    }
    information2_file.close();//关闭文件
    sort(studentss, studentss +student_num);
}
// 计算学生考试成绩和名次
void calc_exam_score_and_rank()
{
    for (int i = 0; i < student_num; i++)
    {
        studentss[i].average = (studentss[i].chinese + studentss[i].math + studentss[i].english) / 3.0; // 计算考试成绩
    }

    sort(studentss, studentss + student_num, compare_averages); // 按照考试成绩排序

    // 计算考试名次
    for (int i = 0; i < student_num; i++)
    {
        if (i == 0)
        {
            studentss[i].rank = 1;
        }
        else if (studentss[i].average == studentss[i - 1].average)
        {
            studentss[i].rank = studentss[i - 1].rank;
        }
        else
        {
            studentss[i].rank = i + 1;
        }
    }
}

// 计算学生综合测评总分和名次
void calc_total_score_and_rank() {
    for (int i = 0; i < student_num; i++) {
        studentss[i].total_score = studentss[i].average * 0.6 + studentss[i].peer_score * 0.1
            + studentss[i].morality_score * 0.1 + studentss[i].teacher_score * 0.2; // 计算综合测评总分
    }

    sort(studentss, studentss + student_num, compare_total_scores); // 按照综合测评总分排序

    // 计算综合测评名次
    for (int i = 0; i < student_num; i++) {
        if (i == 0) {
            studentss[i].total_rank = 1;
        }
        else if (studentss[i].total_score == studentss[i - 1].total_score) {
            studentss[i].total_rank = studentss[i - 1].total_rank;
        }
        else {
            studentss[i].total_rank = i + 1;
        }
    }
}

// 查询学生信息
void query_student_info()
{   int count;
    string id;
    cout << "请输入学号：";
    cin >> id;
    bool found = false;
    for (int i = 0; i < count; i++)
    {
        if (studentss[i].id == id)
        {
            cout << "学号：" << studentss[i].id << endl;
            cout << "姓名：" << studentss[i].name << endl;
            cout << "语文成绩：" << studentss[i].chinese << endl;
            cout << "数学成绩：" << studentss[i].math << endl;
            cout << "外语成绩：" << studentss[i].english << endl;
            cout << "考试平均成绩：" << studentss[i].average << endl;
            cout << "考试名次：" << studentss[i].rank << endl;
            cout << "同学互评分：" << studentss[i].peer_score << endl;
            cout << "品德成绩：" << studentss[i].morality_score << endl;
            cout << "任课教师评分：" << studentss[i].teacher_score << endl;
            cout << "综合测评总分：" << studentss[i].total_score << endl;
            cout << "综合测评名次：" << studentss[i].total_rank << endl;

            found = true;
            break;
        }
    }

    if (!found)
    {
        cout << "没有找到对应学生信息！" << endl;
    }
}
//修改学生信息
void modify_student_info(Student studentss[], int count)
{
    for (int i = 0; i < count; i++)
    {
        string id;
        cout << "请输入学号：";
        cin >> id;
        bool found = false;
        if (studentss[i].id == id)
        {
            cout << "请输入新的语文成绩：";
            cin >> studentss[i].chinese;
            cout << "请输入新的数学成绩：";
            cin >> studentss[i].math;
            cout << "请输入新的英语成绩：";
            cin >> studentss[i].english;
            cout << "请输入新的同学互评分：";
            cin >> studentss[i].peer_score;
            cout << "请输入新的品德成绩：";
            cin >> studentss[i].morality_score;
            cout << "请输入新的任课教师评分：";
            cin >> studentss[i].teacher_score;

            // 重新计算该学生的信息
            studentss[i].average = (studentss[i].chinese + studentss[i].math + studentss[i].english) / 3.0;
        }
    }
}
void bSystem()
{
                cout << "进入学生数据信息处理系统" << endl;
                /* step 1 读取学生信息*/
                read_students(); // 初始化全局学生数组 studentss
//                for (int i = 0; i < 10; ++i) {
//                    cout<<studentss[i].id<<studentss[i].name<<endl;
//                }
                int selectA = 0;
                while (selectA != 3)
                {
                    cout << endl;
                    /* step 2 增删改查*/
                    cout << "1. 查询数据 " << endl;
                    cout << "2. 修改数据" << endl;
                    cout << "3. 退出子系统" << endl;
                    cout << endl << endl;// 输入
                    cin >> selectA;
                    cout << "您输入的是 " << selectA << endl;
//                    Student studentss[MAX_STUDENT_NUM]; // 学生数组
                    getline();
                    read_students();
                    if (selectA == 1)
                    {
                        query_student_info();
                    }
                    else if (selectA == 2)
                    {   
                        modify_student_info(studentss, 1);
                    }
                    else if (selectA == 3)
                    {
                        break;
                    }
                    else
                    {
                        cout << "错误的输入，请重新输入！" << endl;
                    }
                }
}
int main()
{
    bSystem();
//1

}

Answer 1

对你的代码修改了很多，原本的txt可以私信给我

#include <iostream>
#include <fstream>
#include <sstream>
#include <algorithm>

using namespace std;

const int MAX_STUDENT_NUM = 100;

string file_path; // 存储读入文件的路径
int student_num = 0; // 记录读入的学生数量

struct Student
{
    string id;
    string name;
    int chinese;
    int math;
    int english;
    double peer_score;
    double morality_score;
    double teacher_score;
    double average;
    int rank;
    double total_score;
    int total_rank;
} studentss[MAX_STUDENT_NUM];

bool compare_averages(Student a, Student b)
{
    if (a.average == b.average)
    {
        return a.id < b.id;
    }
    return a.average > b.average;
}

bool compare_total_scores(Student a, Student b)
{
    if (a.total_score == b.total_score)
    {
        return a.id < b.id;
    }
    return a.total_score > b.total_score;
}

void read_students()
{
    ifstream input_file(file_path);
    if (!input_file.is_open())
    {
        cout << "无法打开文件！" << endl;
        return;
    }
    string line;
    getline(input_file, line);
    while (getline(input_file, line))
    {
        stringstream ss(line);
        ss >> studentss[student_num].id >> studentss[student_num].name >> studentss[student_num].chinese >> studentss[student_num].math >> studentss[student_num].english >> studentss[student_num].peer_score >> studentss[student_num].morality_score >> studentss[student_num].teacher_score;
        student_num++;
    }
    input_file.close();
    cout << "成功读入 " << student_num << " 名学生的信息！" << endl;
}

void calc_exam_score_and_rank()
{
    for (int i = 0; i < student_num; i++)
    {
        studentss[i].average = (studentss[i].chinese + studentss[i].math + studentss[i].english) / 3.0;
    }
    sort(studentss, studentss + student_num, compare_averages);
    for (int i = 0; i < student_num; i++)
    {
        if (i == 0)
        {
            studentss[i].rank = 1;
        }
        else if (studentss[i].average == studentss[i - 1].average)
        {
            studentss[i].rank = studentss[i - 1].rank;
        }
        else
        {
            studentss[i].rank = i + 1;
        }
    }
}

void calc_total_score_and_rank()
{
    for (int i = 0; i < student_num; i++)
    {
        studentss[i].total_score = studentss[i].average * 0.6 + studentss[i].peer_score * 0.1 + studentss[i].morality_score * 0.1 + studentss[i].teacher_score * 0.2;
    }
    sort(studentss, studentss + student_num, compare_total_scores);
    for (int i = 0; i < student_num; i++)
    {
        if (i == 0)
        {
            studentss[i].total_rank = 1;
        }
        else if (studentss[i].total_score == studentss[i - 1].total_score)
        {
            studentss[i].total_rank = studentss[i - 1].total_rank;
        }
        else
        {
            studentss[i].total_rank = i + 1;
        }
    }
}

void query_student_info()
{
    string id;
    cout << "请输入要查询的学生学号：";
    cin >> id;
    bool found = false;
    for (int i = 0; i < student_num; i++)
    {
        if (studentss[i].id == id)
        {
            cout << "学号：" << studentss[i].id << endl;
            cout << "姓名：" << studentss[i].name << endl;
            cout << "语文成绩：" << studentss[i].chinese << endl;
            cout << "数学成绩：" << studentss[i].math << endl;
            cout << "英语成绩：" << studentss[i].english << endl;
            cout << "平均分：" << studentss[i].average << endl;
            cout << "排名：" << studentss[i].rank << endl;
            cout << "同学互评分：" << studentss[i].peer_score << endl;
            cout << "品德成绩：" << studentss[i].morality_score << endl;
            cout << "任课教师评分：" << studentss[i].teacher_score << endl;
            cout << "综合测评总分：" << studentss[i].total_score << endl;
            cout << "综合测评名次：" << studentss[i].total_rank << endl;
            found = true;
            break;
        }
    }
    if (!found)
    {
        cout << "没有找到对应学生信息！" << endl;
    }
}

void modify_student_info()
{
    string id;
    cout << "请输入要修改的学生学号：";
    cin >> id;
    bool found = false;
    for (int i = 0; i < student_num; i++)
    {
        if (studentss[i].id == id)
        {
            cout << "请输入新的语文成绩：";
            cin >> studentss[i].chinese;
            cout << "请输入新的数学成绩：";
            cin >> studentss[i].math;
            cout << "请输入新的英语成绩：";
            cin >> studentss[i].english;
            cout << "请输入新的同学互评分：";
            cin >> studentss[i].peer_score;
            cout << "请输入新的品德成绩：";
            cin >> studentss[i].morality_score;
            cout << "请输入新的任课教师评分：";
            cin >> studentss[i].teacher_score;

            studentss[i].average = (studentss[i].chinese + studentss[i].math + studentss[i].english) / 3.0;

            calc_exam_score_and_rank();
            calc_total_score_and_rank();

            found = true;
            break;
        }
    }
    if (!found)
    {
        cout << "没有找到对应学生信息！" << endl;
    }
}

void delete_student_info()
{
    string id;
    cout << "请输入要删除的学生学号：";
    cin >> id;

    for (int i = 0; i < student_num; i++)
    {
        if (studentss[i].id == id)
        {
            for (int j = i; j < student_num - 1; j++)
            {
                studentss[j] = studentss[j + 1];
            }
            student_num--;
            cout << "学生信息删除成功！" << endl;
            return;
        }
    }
    cout << "没有找到要删除的学生信息！" << endl;
}

void export_student_info()
{
    string file_path;
    cout << "请输入要导出学生成绩的文件路径：";
    cin >> file_path;
    ofstream output_file(file_path);
    if (!output_file.is_open())
    {
        cout << "无法打开文件！" << endl;
        return;
    }
    output_file << "学号\t姓名\t语文\t数学\t英语\t平均分\t排名\t互评分\t品德\t教师评分\t总分\t总排名\n";
    for (int i = 0; i < student_num; i++)
    {
        output_file << studentss[i].id << "\t" << studentss[i].name << "\t" << studentss[i].chinese << "\t" << studentss[i].math << "\t" << studentss[i].english << "\t" << studentss[i].average << "\t" << studentss[i].rank << "\t" << studentss[i].peer_score << "\t" << studentss[i].morality_score << "\t" << studentss[i].teacher_score << "\t" << studentss[i].total_score << "\t" << studentss[i].total_rank << "\n";
    }
    output_file.close();
    cout << "学生成绩已成功导出到文件 " << file_path << endl;
}

void bSystem()
{
    cout << "进入学生数据信息处理系统" << endl;

    read_students();
    calc_exam_score_and_rank();
    calc_total_score_and_rank();

    int selectA = 0;
    while (selectA != 5)
    {
        cout << endl;
        cout << "1. 查询数据 " << endl;
        cout << "2. 修改数据" << endl;
        cout << "3. 删除数据" << endl;
        cout << "4. 导出学生成绩" << endl;
        cout << "5. 退出子系统" << endl;
        cout << endl << endl;

        cin >> selectA;
        cout << "您输入的是 " << selectA << endl;

        if (selectA == 1)
        {
            query_student_info();
        }
        else if (selectA == 2)
        {
            modify_student_info();
        }
        else if (selectA == 3)
        {
            delete_student_info();
        }
        else if (selectA == 4)
        {
            export_student_info();
        }
        else if (selectA == 5)
        {
            break;
        }
        else
        {
            cout << "错误的输入，请重新输入！" << endl;
        }
    }
}

int main()
{
    cout << "请输入学生信息文件的路径：";
    cin >> file_path;

    bSystem();

    return 0;
}