fork download
copy 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. class Student {
  5. public:
  6.     int id;
  7.     unordered_map<int, int> grades;
  8.     Student(int sId) : id(sId) {}
  9.     void addGrade(int aId, int grd) {
  10.         grades[aId] = grd;
  11.     }
  12.     float getAverageGrade() {
  13.         if (grades.empty()) {
  14.             cout << "No grades available for student " << id << "." << endl;
  15.             return -1.0f;
  16.         }
  17.         int total = 0;
  18.         for (auto const& p : grades) {
  19.             total += p.second;
  20.         }
  21.         return static_cast<float>(total) / grades.size();
  22.     }
  23. };
  24.  
  25. class Assignment {
  26. public:
  27.     int id;
  28.     Assignment(int aId) : id(aId) {}
  29. };
  30.  
  31. class Course {
  32. private:
  33.     unordered_map<int, Student> stds;
  34.     unordered_map<int, Assignment> asgns;
  35.  
  36. public:
  37.     Course() {}
  38.     void addAssignment(int aId) {
  39.         if (asgns.count(aId)) {
  40.             cout << "Assignment " << aId << " already exists." << endl;
  41.             return;
  42.         }
  43.         asgns.emplace(aId, Assignment(aId));
  44.     }
  45.     void enrollStudent(int sId) {
  46.         if (stds.count(sId)) {
  47.             cout << "Student " << sId << " is already enrolled." << endl;
  48.             return;
  49.         }
  50.         stds.emplace(sId, Student(sId));
  51.     }
  52.     void addStudentGrade(int sId, int aId, int grd) {
  53.         if (!stds.count(sId)) {
  54.             cout << "Student " << sId << " is not enrolled." << endl;
  55.             return;
  56.         }
  57.         if (!asgns.count(aId)) {
  58.             cout << "Assignment " << aId << " does not exist." << endl;
  59.             return;
  60.         }
  61.         stds.at(sId).addGrade(aId, grd);
  62.     }
  63.     float getStudentGrade(int sId) {
  64.         if (!stds.count(sId)) {
  65.             cout << "Student " << sId << " is not enrolled." << endl;
  66.             return -1.0f;
  67.         }
  68.         return stds.at(sId).getAverageGrade();
  69.     }
  70. };
  71.  
  72. int main() {
  73.     Course course;
  74.  
  75.     cout << "--- Initial Setup ---" << endl;
  76.     course.enrollStudent(101);
  77.     course.enrollStudent(102);
  78.     course.enrollStudent(103);
  79.     course.enrollStudent(104);
  80.     course.enrollStudent(101);
  81.  
  82.     course.addAssignment(1);
  83.     course.addAssignment(2);
  84.     course.addAssignment(3);
  85.     course.addAssignment(1);
  86.  
  87.     cout << "\n--- Adding Grades ---" << endl;
  88.     course.addStudentGrade(101, 1, 90);
  89.     course.addStudentGrade(101, 2, 80);
  90.     course.addStudentGrade(102, 1, 100);
  91.     course.addStudentGrade(102, 2, 95);
  92.     course.addStudentGrade(102, 3, 98);
  93.     course.addStudentGrade(103, 1, 85);
  94.     course.addStudentGrade(103, 2, 88);
  95.     course.addStudentGrade(105, 1, 90);
  96.     course.addStudentGrade(101, 4, 90);
  97.  
  98.     cout << "\n--- Calculating Averages ---" << endl;
  99.     cout << "Student 101 Average: " << course.getStudentGrade(101) << endl;
  100.     cout << "Student 102 Average: " << course.getStudentGrade(102) << endl;
  101.     cout << "Student 104 Average: " << course.getStudentGrade(104) << endl;
  102. }
  103.  
  104.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
--- Initial Setup ---
Student 101 is already enrolled.
Assignment 1 already exists.

--- Adding Grades ---
Student 105 is not enrolled.
Assignment 4 does not exist.

--- Calculating Averages ---
Student 101 Average: 85
Student 102 Average: 97.6667
Student 104 Average: No grades available for student 104.
-1
https://ideone.com/ZUun7U
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!