30(vi).day code 12 Inheritance

/*
Sample Input

Heraldo Memelli 8135627
2
100 80
Sample Output

 Name: Memelli, Heraldo
 ID: 8135627
 Grade: O
Explanation

This student had  scores to average:  and . The student's average grade is . An average grade of  corresponds to the letter grade , 
so our calculate() method should return the character'O'.

*/
#include <iostream>
#include <vector>

using namespace std;


class Person{
	protected:
		string firstName;
		string lastName;
		int id;
	public:
		Person(string firstName, string lastName, int identification){
			this->firstName = firstName;
			this->lastName = lastName;
			this->id = identification;
		}
		void printPerson(){
			cout<< "Name: "<< lastName << ", "<< firstName <<"\nID: "<< id << "\n"; 
		}
	
};

class Student : public Person
{
vector<int>score;
int sum=0,total=0,sub=0;
double avg=0.0;
public:
   Student(string firstName,string lastName,int id,vector<int>a): Person(firstName,lastName,id)
{
this->score=a;
sub=score.size();
}
char calculate()
{
    char g;
for(unsigned int i=0;i<sub;i++)
{
sum+=score[i];
}
//avg=total/sub;//(score.size());
total = sum/score.size();
return ( total > 89 ? 'O' :
         total > 79 ? 'E' :
         total > 69 ? 'A' :
         total > 54 ? 'P' :
         total > 39 ? 'D' : 'T' );
}
};


int main() {
	string firstName;
  	string lastName;
	int id;
  	int numScores;
	cin >> firstName >> lastName >> id >> numScores;
  	vector<int> scores;
  	for(int i = 0; i < numScores; i++){
	  	int tmpScore;
	  	cin >> tmpScore;
		scores.push_back(tmpScore);
	}
	Student* s = new Student(firstName, lastName, id, scores);
	s->printPerson();
	cout << "Grade: " << s->calculate() << "\n";
	return 0;
}