// grades3.cc
#include <iostream>
#include <string>
using namespace std;

class ClassGrades
{
  private:
    string Name;
    int* Grades;
  
  public:
    ClassGrades(string inName) {
      cout << "In constructor for record " << inName << endl;
      Name = inName;
      Grades = new int[3]; // assume 3 assignments
      for (int i=0; i<3; i++) { Grades[i] = 0; }
    }
    ~ClassGrades() {
      cout << "In destructor for record " << Name << endl;
      if (Grades != NULL) delete [] Grades; 
    }
    ClassGrades(const ClassGrades& src) {
      cout << "In Copy Constructor copying from " << src.Name << endl;
      Name = src.Name;
      Grades = new int[3];
      for (int i=0; i<3; i++) { Grades[i] = src.Grades[i]; } 
    }
    ClassGrades& operator= (const ClassGrades& src) {
      cout << "In Copy Assignment Operator" << endl;
      cout << "Copying record " << src.Name << " into record " << Name << endl;
      Name = src.Name;
      if (this != &src && src.Grades != NULL) {
        if (Grades != NULL) delete[] Grades;
        Grades = new int[3];
        for (int i=0; i<3; i++) { Grades[i] = src.Grades[i]; }
      }
      return *this;
    }
    int& operator [] (int Index) {
      if (Index >=0 && Index < 3) {
        return Grades[Index];
      }
    }
    ClassGrades operator- (const ClassGrades& ToSubtract) {
      cout << "Subtracting record " << ToSubtract.Name;
      cout << " from record " << Name << endl;
      string NewName;
      NewName = Name + " - " + ToSubtract.Name;
      ClassGrades NewClassGrades(NewName);
      for (int i=0; i<3; i++) {
        NewClassGrades[i] = Grades[i] - ToSubtract.Grades[i];
      }
      return NewClassGrades;
    }
    void PrintGrades() {
      cout << "Student " << Name << " has grades: ";
      for (int i=0; i<3; i++) {
        cout << Grades[i] << " ";
      }
      cout << endl;
    }
};

int main()
{
  ClassGrades Student1("John Smith");
  Student1[0] = 99; Student1[1] = 85; Student1[2] = 86;
  Student1.PrintGrades();
  ClassGrades Avg("Class Average");
  Avg[0] = 70; Avg[1] = 72; Avg[2] = 68;
  Avg.PrintGrades();
  // Compute how far above/below Class Avg were each of Student1's scores
  ClassGrades StudentvsAvg("Label-will-be-overwritten");
  StudentvsAvg = Student1 - Avg;
  StudentvsAvg.PrintGrades();
}