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实验作业.cpp

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+#include <iostream>
+#include <vector>
+#include <string>
+
+using namespace std;
+
+struct Student {
+	string name;
+	int id;
+	float score;
+};
+
+vector<Student> students;
+
+void inputData() {
+	Student student;
+	cout << "请输入学生姓名：";
+	cin >> student.name;
+	cout << "请输入学生学号：";
+	cin >> student.id;
+	cout << "请输入学生成绩：";
+	cin >> student.score;
+	students.push_back(student);
+	cout << "录入成功！" << endl;
+}
+
+void modifyOrDeleteData() {
+	int id;
+	cout << "请输入要修改/删除的学生学号：";
+	cin >> id;
+	for (auto it = students.begin(); it != students.end(); ++it) {
+		if (it->id == id) {
+			cout << "学生姓名：" << it->name << "，学号：" << it->id << "，成绩：" << it->score << endl;
+			cout << "请输入新的成绩（输入-1表示删除该学生信息）：";
+			float newScore;
+			cin >> newScore;
+			if (newScore == -1) {
+				students.erase(it);
+				cout << "删除成功！" << endl;
+			} else {
+				it->score = newScore;
+				cout << "修改成功！" << endl;
+			}
+			return;
+		}
+	}
+	cout << "未找到该学生信息！" << endl;
+}
+
+void viewStatistics() {
+	float totalScore = 0;
+	for (const auto& student : students) {
+		totalScore += student.score;
+	}
+	float averageScore = students.empty() ? 0 : totalScore / students.size();
+	cout << "学生人数：" << students.size() << "，总成绩：" << totalScore << "，平均成绩：" << averageScore << endl;
+}
+
+int main() {
+	while (true) {
+		cout << "学生成绩信息管理系统菜单：" << endl;
+		cout << "1. 数据录入" << endl;
+		cout << "2. 数据修改/删除" << endl;
+		cout << "3. 统计查看" << endl;
+		cout << "4. 退出系统" << endl;
+		cout << "请选择功能编号：";
+		
+		int choice;
+		cin >> choice;
+		
+		switch (choice) {
+		case 1:
+			inputData();
+			break;
+		case 2:
+			modifyOrDeleteData();
+			break;
+		case 3:
+			viewStatistics();
+			break;
+		case 4:
+			cout << "感谢使用！" << endl;
+			return 0;
+		default:
+			cout << "无效的功能编号！" << endl;
+		}
+	}
+	
+	return 0;
+}