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Solved Mărire
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Marire/README.md
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Marire/README.md
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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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Marire/marire.cpp
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Marire/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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@ -3,3 +3,4 @@
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- [Lab1](./Lab1/)
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- [Lab2](./Lab2/)
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- [Lab3](./Lab3/)
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- [Mărire](./Marire/)
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