修改这一段 #include #include #include #include #include #include using namespace std; struct Student { string student_id; string name; string major; int math_score; int chinese

#include #include #include #include #include #include

using namespace std;

struct Student {

string student_id;
string name;
string major;
int math_score;
int chinese_score;
int english_score;
int total_score;

};

// 解析数据文件中的一行并创建一个学生对象 Student parseStudent(const string& line) {

istringstream ss(line);
string student_id, name, major;
int math_score, chinese_score, english_score;
ss >> student_id >> name >> major >> math_score >> chinese_score >> english_score;
int total_score = math_score + chinese_score + english_score;
return { student_id, name, major, math_score, chinese_score, english_score, total_score };

}

// 从文件中读取数据并将其存储在学生对象的向量中 vector readDataFromFile(const string& filename) {

vector<Student> students;
ifstream file(filename);
if (file.is_open()) {
	string line;
	while (getline(file, line)) {
		students.push_back(parseStudent(line));
	}
	file.close();
}
else {
	cerr << "错误：无法打开文件 " << filename << endl;
}
return students;

}

// 用于按总分排序的比较函数（降序） bool compareByTotalScore(const Student& a, const Student& b) {

return a.total_score > b.total_score;

}

void outputStudentsByMajor(const vector& students) {

map<string, vector<Student>> studentsByMajor;
map<string, int> totalScoreByMajor;

// 初始化每个专业的总评分为0
for (const auto& student : students) {
	totalScoreByMajor[student.major] = 0;
}

// 将学生按专业分类，并计算每个专业的总评分
for (const auto& student : students) {
	studentsByMajor[student.major].push_back(student);
	totalScoreByMajor[student.major] += student.total_score;
}

// 输出每个专业的学生总评信息
for (auto& pair : studentsByMajor) {
	sort(pair.second.begin(), pair.second.end(), compareByTotalScore);
	cout << "专业：" << pair.first << endl;
	cout << "总评：" << totalScoreByMajor[pair.first] << " 分" << endl;
	for (size_t i = 0; i < pair.second.size(); ++i) {
		cout << "排名 " << i + 1 << "：" << pair.second[i].name << "（" << pair.second[i].total_score << " 分）" << endl;
	}
	cout << endl;
}

}

// 按姓名查找学生信息 void searchStudentByName(const vector& students, const string& name) {

bool found = false;
for (const auto& student : students) {
	if (student.name == name) {
		cout << "找到学生：" << endl;
		cout << "姓名：" << student.name << endl;
		cout << "学号：" << student.student_id<< endl;
		cout<< "专业："  student.major<<endl;
         cout<<"数学成绩："<<student.math_score<<endl；
		 cout<<"语文成绩："<<student.chinese_score<<endl；
		  cout<<"英语成绩："<<student.english_score<<endl；
		   cout<<"总分："<<student.total_score<<endl；


















		found = true;
		break;
	}
}
if (!found) {
	cout << "未找到姓名为 '" << name << "' 的学生。" << endl;
}

}

int main() {

string filename = "data.txt";
vector<Student> students = readDataFromFile(filename);

cout << "按专业输出学生总评信息：" << endl;
outputStudentsByMajor(students);

// 按姓名查找学生信息
string nameToSearch = "张家辉"; // 修改此处为你想要查找的姓名
cout << "正在查找姓名为 '" << nameToSearch<< "' 的学生：" << endl;
searchStudentByName(students, nameToSearch);

return 0;

}

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