student

#include #include #include

const int MAX_STUDENTS = 100;

struct Student { std::string name; int score; };

void inputData(Student students[], int& numStudents) { if (numStudents >= MAX_STUDENTS) { std::cout << "学生数量已达上限！" << std::endl; return; } std::cout << "请输入学生姓名: "; std::cin >> students[numStudents].name; std::cout << "请输入学生成绩（0 - 100）: "; std::cin >> students[numStudents].score; while (students[numStudents].score < 0 || students[numStudents].score > 100) { std::cout << "成绩输入有误，请重新输入: "; std::cin >> students[numStudents].score; } numStudents++; }

void modifyData(Student students[], int numStudents) { int index; std::cout << "请输入要修改的学生编号: "; std::cin >> index; if (index < 0 || index >= numStudents) { std::cout << "编号有误！" << std::endl; return; } std::cout << "当前成绩: " << students[index].score << std::endl; std::cout << "请输入新成绩（0 - 100）: "; std::cin >> students[index].score; while (students[index].score < 0 || students[index].score > 100) { std::cout << "输入有误，重新输入: "; std::cin >> students[index].score; } }

void deleteData(Student students[], int& numStudents) { int index; std::cout << "请输入要删除的学生编号: "; std::cin >> index; if (index < 0 || index >= numStudents) { std::cout << "编号有误！" << std::endl; return; } for (int i = index; i < numStudents - 1; i++) { students[i] = students[i + 1]; } numStudents--; }

void viewStatistics(Student students[], int numStudents) { int highest = students[0].score; int lowest = students[0].score; int total = 0; for (int i = 0; i < numStudents; i++) { if (students[i].score > highest) { highest = students[i].score; } if (students[i].score < lowest) { lowest = students[i].score; } total += students[i].score; } double average = static_cast(total) / numStudents; std::cout << "最高分: " << highest << std::endl; std::cout << "最低分: " << lowest << std::endl; std::cout << "平均分: " << average << std::endl; }

void saveData(Student students[], int numStudents) { std::ofstream file("student_data.txt"); if (file.is_open()) { for (int i = 0; i < numStudents; i++) { file << students[i].name << " " << students[i].score << std::endl; } file.close(); std::cout << "数据保存成功！" << std::endl; } else { std::cout << "保存失败！" << std::endl; } }

void readData(Student students[], int& numStudents) { std::ifstream file("student_data.txt"); if (file.is_open()) { numStudents = 0; while (!file.eof()) { file >> students[numStudents].name >> students[numStudents].score; numStudents++; } numStudents--; file.close(); std::cout << "数据读取成功！" << std::endl; } else { std::cout << "未找到文件，重新录入！" << std::endl; } }

int main() { Student students[MAX_STUDENTS]; int numStudents = 0; int choice; std::cout << "是否读取数据（1 - 是，0 - 否）: "; std::cin >> choice; if (choice == 1) { readData(students, numStudents); } while (true) { std::cout << "1. 录入 2. 修改/删除 3. 统计 4. 退出" << std::endl; std::cin >> choice; switch (choice) { case 1: inputData(students, numStudents); break; case 2: std::cout << "1. 修改 2. 删除" << std::endl; int subChoice; std::cin >> subChoice; if (subChoice == 1) { modifyData(students, numStudents); } else if (subChoice == 2) { deleteData(students, numStudents); } else { std::cout << "无效选择！" << std::endl; } break; case 3: viewStatistics(students, numStudents); break; case 4: saveData(students, numStudents); return 0; default: std::cout << "无效选择，重新输入！" << std::endl; } } return 0; }