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C1980A470C3EE5B1
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# CCIoT |
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## Mărire |
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### Problem |
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A menu is created through which: |
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1. Create a list of students identified by (name, year, 10 courses and 10 grades for each student, and the average corresponding to each student). |
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2. The list of students with all the data corresponding to each student is displayed. |
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3. Calculate the general average of each student (display name and average). |
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4. Students are displayed in descending order of average. Students with the same average are sorted alphabetically (display name + average + year). |
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5. All students from year 3 are displayed who have an average over 8.00 (name + year + average). |
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6. Insert a student's data (read from the keyboard) after the k-th(position in the list) student. If there are no k students it will be inserted at the beginning |
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or at the end of the list (user choice). |
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7. Remove all non-promoted students (average below 5.00) from the list. |
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8. Exit |
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### Solution |
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See [marire.cpp](./marire.cpp). |
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#include <iostream> // std::cin, std::cout |
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#include <iomanip> // std::setw, std::fixed, std::setprecision |
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#include <string> // std::string |
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#include <vector> // std::vector |
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#include <utility> // std::pair |
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#include <numeric> // std::accumulate |
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#include <algorithm> // std::sort |
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#include <array> // std::array |
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#include <cstdlib> // std::rand, std::srand |
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#include <ctime> // std::time |
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using std::cin; |
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using std::cout; |
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using std::endl; |
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class Student { |
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private: |
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std::string _name; |
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int _year; |
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std::vector<std::pair<std::string, double>> _course_grades; |
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public: |
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std::string get_name() const { return _name; } |
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void set_name(const std::string &new_name) { _name = new_name; } |
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int get_year() const { return _year; } |
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void set_year(int new_year) { _year = new_year; } |
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const std::vector<std::pair<std::string, double>>& get_course_grades() const { return _course_grades; } |
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void set_course_grades(const std::vector<std::pair<std::string, double>> new_course_grades) { _course_grades = new_course_grades; } |
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void add_course_grade(const std::string& course_name, double grade) { |
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_course_grades.emplace_back(course_name, grade); |
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} |
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double get_average() const { |
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return std::accumulate( |
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_course_grades.begin(), |
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_course_grades.end(), |
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0.0, |
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[](double acc, const std::pair<std::string, double> &next){ |
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return acc + next.second; |
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} |
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) / _course_grades.size(); |
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} |
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}; |
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// for pretty printing:
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int max_student_name = 12; |
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void list_students(const std::vector<Student>& students) { |
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cout << "Listing " << students.size() << " student" << (students.size() == 1 ? "" : "s") << endl; |
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int index = 1; |
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for (const auto &student : students) { |
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cout << index << ". " << student.get_name() << " (year " << student.get_year() << "):" << endl; |
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for (const auto& course : student.get_course_grades()) { |
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cout << " " << course.first << " - " << std::fixed << std::setprecision(2) << course.second << endl; |
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} |
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index++; |
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} |
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} |
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void list_averages(const std::vector<Student>& students) { |
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cout << std::setw(max_student_name) << "Student Name" << " | " << "Average" << endl; |
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for (const auto& student: students) { |
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cout << std::setw(max_student_name) << student.get_name() << " | " << std::fixed << std::setprecision(2) << student.get_average() << endl; |
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} |
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} |
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void list_sorted(std::vector<Student> students) { |
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std::sort( |
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students.begin(), |
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students.end(), |
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[](const Student &s1, const Student &s2) { |
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const auto s1_avg = s1.get_average(); |
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const auto s2_avg = s2.get_average(); |
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if (s1_avg != s2_avg) {
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return s1_avg > s2_avg;
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} |
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else { |
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return s1.get_name() < s2.get_name(); |
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} |
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} |
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); |
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cout << std::setw(max_student_name) << "Student Name" << " | Average | Year" << endl; |
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for (const auto& student: students) { |
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cout
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<< std::setw(max_student_name) << student.get_name()
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<< " | "
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<< std::setw(7) << std::fixed << std::setprecision(2) << student.get_average()
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<< " | " |
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<< student.get_year() |
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<< endl; |
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} |
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} |
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void list_year3_agt8(const std::vector<Student>& students) { |
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cout << "Students from year 3 with average over 8:" << endl; |
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cout << std::setw(max_student_name) << "Student Name" << " | Year | Average" << endl; |
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for (const auto& student: students) { |
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if (student.get_year() == 3 && student.get_average() > 8) { |
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cout
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<< std::setw(max_student_name) << student.get_name()
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<< " | "
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<< std::setw(4) << student.get_year() |
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<< " | " |
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<< std::fixed << std::setprecision(2) << student.get_average()
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<< endl; |
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} |
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} |
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} |
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void insert_student(std::vector<Student>& students) { |
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std::string name; |
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int year; |
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std::vector<std::pair<std::string, double>> courses_grades; |
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cout << "Name? "; |
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do { |
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std::getline(cin, name); |
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} while (name.length() == 0); |
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cout << "Year? "; |
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cin >> year; |
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// Workaround for newline stuck in buffer
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std::string tmp; |
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std::getline(cin, tmp); |
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while (true) { |
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std::string course_name; |
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double grade; |
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cout << "Course name? (Enter without typing to stop) "; |
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std::getline(cin, course_name); |
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if (course_name.length() == 0) { |
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break; |
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} |
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cout << "Grade? "; |
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cin >> grade; |
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// Workaround for newline stuck in buffer
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std::getline(cin, tmp); |
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courses_grades.emplace_back(course_name, grade); |
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} |
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cout << "Added student." << endl; |
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Student new_student; |
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new_student.set_name(name); |
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if (new_student.get_name().length() > max_student_name) { |
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max_student_name = new_student.get_name().length(); |
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} |
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new_student.set_year(year); |
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new_student.set_course_grades(courses_grades); |
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students.push_back(new_student); |
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} |
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int remove_alt5(std::vector<Student>& students) { |
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std::vector<int> indeces_to_remove; |
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for (int i = students.size() - 1; i >= 0; i--) { |
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if (students[i].get_average() < 5) { |
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indeces_to_remove.push_back(i); |
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} |
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} |
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for (auto i : indeces_to_remove) { |
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students.erase(students.begin() + i); |
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} |
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return indeces_to_remove.size(); |
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} |
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std::array<const char *, 21> mock_names = { |
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"Elena", |
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"Mircea", |
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"Cornel", |
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"Ion", |
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"Nicolae", |
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"Mihai", |
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"Lavinia", |
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"Nicoleta", |
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"Ana", |
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"Denisa", |
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"Diana", |
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"Gheorghe", |
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"Darius", |
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"Sorin", |
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"Dragos", |
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"Stefan", |
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"Ioan", |
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"Viorel", |
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"Virgil", |
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"Octavian", |
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"Alina" |
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}; |
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std::array<const char *, 20> mock_courses = { |
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"Maths", |
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"IT", |
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"C++", |
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"Java", |
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"Networking", |
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"Design", |
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"Class 7", |
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"Class 8", |
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"Class 9", |
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"Class 10", |
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"Class 11", |
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"Class 12", |
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"Class 13", |
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"Class 14", |
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"Class 15", |
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"Class 16", |
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"Class 17", |
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"Class 18", |
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"Class 19", |
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"Class 20", |
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}; |
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void fill_with_mock_data(std::vector<Student>& students) { |
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// insert between 5 and 9 mock students
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int count = 5 + (std::rand() % 5);
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for (int i = 0; i < count; i++) { |
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int name_idx = std::rand() % mock_names.size(); |
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Student new_student; |
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new_student.set_name(mock_names[name_idx]); |
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if (new_student.get_name().length() > max_student_name) { |
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max_student_name = new_student.get_name().length(); |
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} |
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new_student.set_year(1 + std::rand() % 3); |
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for (int j = 0; j < 10; j++) { |
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int course_idx = std::rand() % mock_courses.size(); |
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new_student.add_course_grade(mock_courses[course_idx], (2 + (std::rand() % 19)) / 2.0); |
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} |
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students.push_back(new_student); |
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} |
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} |
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int main() { |
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// seed rand
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std::srand(std::time(nullptr)); |
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std::vector<Student> students; |
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fill_with_mock_data(students); |
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int choice; |
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while (true) { |
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cout << "1. List students" << endl; |
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cout << "2. List averages" << endl; |
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cout << "3. Display sorted by averages" << endl; |
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cout << "4. Display students from year 3 with average > 8.0" << endl; |
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cout << "5. Insert student data" << endl; |
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cout << "6. Remove non-promoted students" << endl; |
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cout << "0. Exit" << endl; |
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if (!(cin >> choice)) { |
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// Stop on end of input (Ctrl+D on Linux)
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break; |
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} |
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bool exit{false}; |
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switch (choice) { |
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case 0: |
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exit = true; |
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break; |
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case 1: |
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list_students(students); |
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break; |
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case 2: |
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list_averages(students); |
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break; |
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case 3: |
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list_sorted(students); |
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break; |
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case 4: |
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// list year 3 with average greater than 8
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list_year3_agt8(students); |
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break; |
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case 5: |
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insert_student(students); |
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break; |
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case 6: |
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// remove average less than 5
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int removed = remove_alt5(students); |
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cout << "Removed " << removed << " student" << (removed == 1 ? "" : "s") << endl; |
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break; |
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} |
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if (exit) { |
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break; |
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} |
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} |
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} |
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