ADD file via upload

Untitled3.cpp

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+#include <iostream>
+#include <fstream>
+#include <iomanip>
+#include <limits>
+
+using namespace std;
+
+const int MAX_STUDENTS = 100; // 最大学生数
+
+struct StudentScore {
+	string name;
+	int score;
+};
+
+int main() {
+	StudentScore students[MAX_STUDENTS];
+	int numStudents = 0; // 实际学生数
+	
+	// 读取文件数据
+	ifstream inFile("student_scores.txt");
+	if (inFile.is_open()) {
+		while (inFile >> students[numStudents].name >> students[numStudents].score) {
+			numStudents++;
+		}
+		inFile.close();
+		cout << "已从文件中读取 " << numStudents << " 个学生成绩数据." << endl;
+	} else {
+		cout << "无法打开文件,将从头开始." << endl;
+	}
+	
+	while (true) {
+		cout << "=== 学生成绩信息管理系统 ===" << endl;
+		cout << "1. 录入学生成绩" << endl;
+		cout << "2. 修改/删除学生成绩" << endl;
+		cout << "3. 查看统计信息" << endl;
+		cout << "4. 退出系统" << endl;
+		cout << "请输入您的选择(1-4): ";
+		
+		int choice;
+		cin >> choice;
+		
+		switch (choice) {
+			case 1: { // 录入学生成绩
+				if (numStudents == MAX_STUDENTS) {
+					cout << "已达到最大学生数,无法继续录入." << endl;
+					break;
+				}
+				cout << "请输入学生姓名: ";
+				cin >> students[numStudents].name;
+				cout << "请输入学生成绩(0-100): ";
+				while (!(cin >> students[numStudents].score) || students[numStudents].score < 0 || students[numStudents].score > 100) {
+					cout << "无效的成绩,请重新输入(0-100): ";
+					cin.clear();
+					cin.ignore(numeric_limits<streamsize>::max(), '\n');
+				}
+				numStudents++;
+				cout << "学生成绩录入成功!" << endl;
+				break;
+			}
+			case 2: { // 修改/删除学生成绩
+				if (numStudents == 0) {
+					cout << "当前没有任何学生成绩数据." << endl;
+					break;
+				}
+				cout << "请输入要修改/删除的学生编号(0-" << numStudents - 1 << "): ";
+				int index;
+				cin >> index;
+				if (index < 0 || index >= numStudents) {
+					cout << "无效的编号!" << endl;
+					break;
+				}
+				cout << "学生姓名: " << students[index].name << ", 当前成绩: " << students[index].score << endl;
+				cout << "1. 修改成绩" << endl;
+				cout << "2. 删除学生" << endl;
+				cout << "请输入您的选择(1-2): ";
+				int subChoice;
+				cin >> subChoice;
+				if (subChoice == 1) {
+					cout << "请输入新的成绩(0-100): ";
+					while (!(cin >> students[index].score) || students[index].score < 0 || students[index].score > 100) {
+						cout << "无效的成绩,请重新输入(0-100): ";
+						cin.clear();
+						cin.ignore(numeric_limits<streamsize>::max(), '\n');
+					}
+					cout << "成绩修改成功!" << endl;
+				} else if (subChoice == 2) {
+					for (int i = index; i < numStudents - 1; i++) {
+						students[i] = students[i + 1];
+					}
+					numStudents--;
+					cout << "学生信息删除成功!" << endl;
+				} else {
+					cout << "无效的选择!" << endl;
+				}
+				break;
+			}
+			case 3: { // 查看统计信息
+				if (numStudents == 0) {
+					cout << "当前没有任何学生成绩数据." << endl;
+					break;
+				}
+				int maxScore = 0, minScore = 100;
+				int totalScore = 0;
+				for (int i = 0; i < numStudents; i++) {
+					if (students[i].score > maxScore) {
+						maxScore = students[i].score;
+					}
+					if (students[i].score < minScore) {
+						minScore = students[i].score;
+					}
+					totalScore += students[i].score;
+				}
+				double avgScore = static_cast<double>(totalScore) / numStudents;
+				cout << "学生成绩统计信息:" << endl;
+				cout << "最高分: " << maxScore << endl;
+				cout << "最低分: " << minScore << endl;
+				cout << "平均分: " << fixed << setprecision(2) << avgScore << endl;
+				break;
+			}
+			case 4: { // 退出系统
+				// 保存数据到文件
+				ofstream outFile("student_scores.txt");
+				if (outFile.is_open()) {
+					for (int i = 0; i < numStudents; i++) {
+						outFile << students[i].name << " " << students[i].score << endl;
+					}
+					outFile.close();
+					cout << "学生成绩数据已保存到文件." << endl;
+				} else {
+					cout << "无法打开文件,学生成绩数据未保存." << endl;
+				}
+				cout << "程序已退出." << endl;
+				return 0;
+			}
+		default:
+			cout << "无效的选择,请重试." << endl;
+			break;
+		}
+	}
+	
+	return 0;
+}