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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4.  
  5. class StudentGradesInfo {
  6. private:
  7.     static int cnt;
  8.     string student_name;
  9.     string student_id;
  10.     vector<string> course_names;
  11.     vector<double> grades;
  12.     int idx = -1; // Iterator for grades
  13.  
  14. public:
  15.     friend class Printer;
  16.     static int total_prints;
  17.  
  18.     StudentGradesInfo(string name, string id) : student_name(name), student_id(id) {
  19.         cnt++;
  20.     }
  21.  
  22.     double GetGrade(double grade) {
  23.         if (grade < 0 || grade > 100) {
  24.             cout << "Invalid grade entered.\n";
  25.             return -1;
  26.         }
  27.         return grade;
  28.     }
  29.  
  30.     bool AddGrade(double grade, string course_name) {
  31.         grade = GetGrade(grade);
  32.         if (grade == -1) return false;
  33.  
  34.         for (auto course : course_names) {
  35.             if (course == course_name) {
  36.                 cout << "Course already exists.\n";
  37.                 return false;
  38.             }
  39.         }
  40.         grades.push_back(grade);
  41.         course_names.push_back(course_name);
  42.         return true;
  43.     }
  44.  
  45.     string getId() {
  46.         return student_id;
  47.     }
  48.  
  49.     void PrintAllCourses() {
  50.         total_prints++;
  51.         cout << "Grades for student: " << student_id << "\n";
  52.         for (size_t i = 0; i < course_names.size(); ++i)
  53.             cout << course_names[i] << " = " << grades[i] << "\n";
  54.  
  55.         cout << "-------------------------------------\n";
  56.     }
  57.  
  58.     int getCourseTotalCount() {
  59.         return course_names.size();
  60.     }
  61.  
  62.     string getCourseName_Grade(int idx) {
  63.         if (idx < 0 || idx >= (int)course_names.size()) {
  64.             return "invalid";
  65.         }
  66.         string ans = course_names[idx] + "_" + to_string(grades[idx]);
  67.         return ans;
  68.     }
  69.  
  70.     string get_total_gradesSum() {
  71.         double sum = 0;
  72.         double total = getCourseTotalCount() * 100.0;
  73.         for (size_t i = 0; i < grades.size(); ++i) {
  74.             sum += grades[i];
  75.         }
  76.         return to_string((int)sum) + "/" + to_string((int)total);
  77.     }
  78.  
  79.     // Iterator functions
  80.     string getNext() {
  81.         if (!hasNext()) {
  82.             cout << "No more courses\n";
  83.             return "";
  84.         }
  85.         idx++;
  86.         return course_names[idx] + " = " + to_string((int)grades[idx]);
  87.     }
  88.  
  89.     bool hasNext() {
  90.         return idx + 1 < (int)course_names.size();
  91.     }
  92.  
  93. };
  94.  
  95. int StudentGradesInfo::total_prints = 0;
  96. int StudentGradesInfo::cnt = 0;
  97.  
  98. class Printer {
  99. public:
  100.     string id, name;
  101.     StudentGradesInfo &obj;
  102.  
  103.     Printer(StudentGradesInfo& obj) : obj(obj), id(obj.getId()), name(obj.student_name) {}
  104.  
  105.     bool hasNext() {
  106.         return obj.hasNext();
  107.     }
  108.  
  109.     string getNext() {
  110.         return obj.getNext();
  111.     }
  112.  
  113.     void resetIterator() {
  114.         obj.idx=-1;
  115.     }
  116. };
  117.  
  118. int main() {
  119.     StudentGradesInfo student("john", "1234");
  120.     Printer printer(student);
  121.  
  122.     student.AddGrade(50, "Math");
  123.     student.AddGrade(60, "programming 1");
  124.  
  125.     int limit = 3;
  126.     cout << "Print top " << limit << " Grades, if available:\n";
  127.     while (limit-- && printer.hasNext()) {
  128.         cout <<'\t'<< printer.getNext() << endl;
  129.     }
  130.  
  131.     student.AddGrade(70, "allgorithm");
  132.     student.AddGrade(67, "Programming2");
  133.  
  134.     printer.resetIterator();
  135.  
  136.     limit = 3;
  137.     cout <<endl;
  138.     cout << "Print top " << limit << " Grades, if available:\n";
  139.     while (limit-- && printer.hasNext()) {
  140.         cout <<'\t' <<printer.getNext() << endl;
  141.     }
  142.  
  143.     return 0;
  144. }
  145.  
Success #stdin #stdout 0.01s 5288KB
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Standard input is empty
stdout
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Print top 3 Grades, if available:
	Math = 50
	programming 1 = 60

Print top 3 Grades, if available:
	Math = 50
	programming 1 = 60
	allgorithm = 70
https://ideone.com/q3cHE1
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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