Reading file from .csv in c++

I am writing a program that takes input from the .csv file. The program run but the problem is it only returns the last line of the .csv file and skips all the other 9 lines. It also does not display the average and the grade. Please help me figure out what I am doing wrong.

The professor is very specific about using what we have learned so far and that is loops and functions. I can only use loops and functions so I am not allowed to use arrays.

Here's the scores.csv file

#include <iostream>
#include <fstream>

using namespace std;
int testScore1, testScore2, testScore3, testScore4, testScore5;
double avg;
char grade;

double getAvg(int testScore1, int testScore2, int testScore3, int testScore4, int testScore5){
    avg = (testScore1 + testScore2 + testScore3 + testScore4 + testScore5)/5;
    return avg;
}
char getGrade(double avg){
    if (avg >= 90){
        grade = 'A';
        cout << 'A' << endl;
    }else if (avg >= 80){
        grade = 'B';
        cout << 'B' << endl;
    }else if (avg >= 70){
        grade = 'C';
        cout << 'C' << endl;
    }else if (avg >= 60){
        grade = 'D';
        cout << 'D' << endl;
    }else{
        grade = 'F';
        cout << 'F' << endl;
    }
    return grade;
}

int main(){
    
    ifstream myFile;
    myFile.open("scores.csv");
    
    
    if(!myFile.is_open()){
        cout << "Error" << endl;
    }
    string testScore1, testScore2, testScore3, testScore4, testScore5;
    while (myFile.good()) {
        
        getline(myFile, testScore1, ',');
        getline(myFile, testScore2, ',');
        getline(myFile, testScore3, ',');
        getline(myFile, testScore4, ',');
        getline(myFile, testScore5, '\n');

    }
    
        cout<< setw(15) <<" Test scores"<<endl;
        cout<<"--------------------"<<endl;
        cout<< " 1   2   3   4   5   Avg  Grade"<<endl;
        cout<<"=== === === === === ===== ====="<<endl;
        cout<< " "<< testScore1<< "  "<< testScore2 << "  "<< testScore3 << "  "<< testScore4 << "  "<< testScore5<< "  " << getAvg << "  " << getGrade <<endl;


    return 0;
}

Solution

An answer has been given already and accepted.

To be complete, I will show a refactored and working version your code.

I uses no arrays. Just loops and functions.

#include <iostream>
#include <fstream>
#include <iomanip>

double getAvg(int testScore1, int testScore2, int testScore3, int testScore4, int testScore5){
    double avg = (testScore1 + testScore2 + testScore3 + testScore4 + testScore5)/5.0;
    return avg;
}
char getGrade(double avg){
    char grade = 'F';
    if (avg >= 90){
        grade = 'A';
    }else if (avg >= 80){
        grade = 'B';
    }else if (avg >= 70){
        grade = 'C';
    }else if (avg >= 60){
        grade = 'D';
    }
    return grade;
}

int main(){
    
    std::ifstream myFile("scores.csv");

    if(!myFile){
        std::cerr << "\nError: Could not open input file\n";
    }
    else {

        std::cout<< std::setw(15) <<" Test scores\n--------------------\n 1   2   3   4   5   Avg  Grade\n=== === === === === ===== =====\n";
       
        int testScore1, testScore2, testScore3, testScore4, testScore5;
        char comma1, comma2, comma3, comma4;
        
        // Read all values in one line, then next line, next line and so on
        while (myFile >> testScore1 >> comma1 >> testScore2 >> comma2 >> testScore3 >> comma3 >> testScore4 >> comma4 >> testScore5) {
            
            // Calculate
            double average = getAvg(testScore1, testScore2, testScore3, testScore4, testScore5);
            char grade = getGrade(average);
            std::cout<< " "<< testScore1<< "  "<< testScore2 << "  "<< testScore3 << "  "<< testScore4 << "  "<< testScore5<< "  " << average << "  " << grade << '\n';
        }
    }
    return 0;
}