Update README.md

README.md

@@ -1,2 +1,151 @@
 # 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;
+}