输入输出和文件，面向对象程序设计

Question

class Student { public: void InputStudent(Date &birthday) { ofstream outfile("student.txt", ios::app); cout << "请输入学号："; cin >> num; cout << "请输入姓名："; cin >> name; birthday.SetDate(); cout << "请输入性别："; cin >> gender; cout << "请输入3门课成绩："; cin >> score1 >> score2 >> score3; double average = (score1 + score2 + score3) / 3.0; int maxscore = max({score1, score2, score3}); int minscore = min({score1, score2, score3}); outfile << num << " " << name << " " << birthday.GetYear() << " " << birthday.GetMonth() << " " << birthday.GetDay()<< " " << gender << " " << score1 << " " << score2 << " " << score3 << " " << average << " " << maxscore << " " << minscore << endl; cout << "学生信息录入成功！" << endl; outfile.close(); } //2.浏览学生全部信息 void OutputStudents() { ifstream infile("student.txt"); string line; while (getline(infile, line)) { cout << line << endl; } infile.close(); } //3.按学号查找学生记录 void FindByNum(int findnum) { ifstream infile("student.txt"); int num; string line; bool found = false; while (infile >> num) { if (num == findnum) { getline(infile, line); cout << num << " " << line << endl; found = true; break; } getline(infile, line); } infile.close(); if (!found) { cout << "未找到学号为 " << findnum << " 的学生" << endl; } } //4.按学号删除学生记录 void DeleteByID(int findnum) { fstream file("student.txt"); ofstream temp("temp.txt"); string line; int num; bool found = false; while (file >> num) { getline(file, line); if (num != findnum) { temp << num << " " << line << endl; } else { found = true; } } file.close(); temp.close(); if (found) { remove("student.txt"); rename("temp.txt", "student.txt"); cout << "已成功删除学号为 " << findnum << " 的学生记录！" << endl; } else { cout << "未找到学号为 " << findnum << " 的学生记录。" << endl; } } //5.按学号修改出生日期 void AlterDateByNum(int findnum) { fstream file("student.txt"); ofstream temp("temp.txt"); int num; string name, gender, line; int year, month, day, score1, score2, score3; double average; bool found = false; while (file >> num >> name >> year >> month >> day >> gender >> score1 >> score2 >> score3 >> average) { if (num == findnum) { Date newDate; newDate.SetDate(); temp << num << " " << name << " " << newDate.GetYear() << " " << newDate.GetMonth() << " " << newDate.GetDay() << " " << gender << " " << score1 << " " << score2 << " " << score3 << " " << average << endl; found = true; cout << "已成功修改学号为 " << num << " 的学生的出生日期！" << endl; } else { temp << num << " " << name << " " << year << " " << month << " " << day << " " << gender << " " << score1 << " " << score2 << " " << score3 << " " << average << endl; } } file.close(); temp.close(); remove("student.txt"); rename("temp.txt", "student.txt"); if (!found) { cout << "未找到学号为 " << findnum << " 的学生" << endl; } } //6. 按学号修改学生成 void AlterScoreByNum(int findnum) { fstream file("student.txt"); ofstream temp("temp.txt"); int num; string name, gender, line; int year, month, day, score1, score2, score3; double average; bool found = false; while (file >> num >> name >> year >> month >> day >> gender >> score1 >> score2 >> score3 >> average) { if (num == findnum) { int newScore1, newScore2, newScore3; cout << "请输入新的三门课成绩: "; cin >> newScore1 >> newScore2 >> newScore3; double newAverage = (newScore1 + newScore2 + newScore3) / 3.0; int newMax = max({newScore1, newScore2, newScore3}); int newMin = min({newScore1, newScore2, newScore3}); temp << num << " " << name << " " << year << " " << month << " " << day << " " << gender << " " << newScore1 << " " << newScore2 << " " << newScore3 << " " << newAverage << " " << newMax << " " << newMin << endl; found = true; cout << "已成功修改学号为 " << num << " 的学生成绩！" << endl; } else { temp << num << " " << name << " " << year << " " << month << " " << day << " " << gender << " " << score1 << " " << score2 << " " << score3 << " " << average << endl; } } file.close(); temp.close(); remove("student.txt"); rename("temp.txt", "student.txt"); if (!found) { cout << "未找到学号为 " << findnum << " 的学生" << endl; } } private: int num; string name; string gender; int score1, score2, score3; };这个代码要怎么分析呢，编码的大概大概步骤是什么，然后进行结果分析，是否能实现题目所有功能

Answer 1

"使用ofstream创建文件并赋值"

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