student/README.md

# student
#include <iostream>
#include <fstream>
#include <string>

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<double>(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;
}