How do I stop the debugger from skipping my functions?

Question

I am trying to calculate students grades from a file. When entering the if statement the debugger skips all my functions and ends the program. I think it has something to do with the file not being inputted well.

int main()
{
    string temp, out = "";
    ifstream RF("TestAnswers(5).txt");
    while (getline(RF, temp))
    {
        out += temp;
    }
    GradeCalc gCalc;
    gCalc.gradeAspects(out);
    gCalc.gradeCalculation();
    gCalc.grade();
}
class GradeCalc
{
private:
#define DELIM ',' 

    struct GradeAspects
    {
        string studentN;
        string answers;
        string firstname, lastname;
        double scores;
        int rsize;
        string percent;
        string readFile; // int read;
    };
    vector<GradeAspects> read;
    GradeAspects readFile[25];

public:
    void gradeAspects(string filename);
    void gradeCalculation();
    void grade();
};

void GradeCalc::gradeAspects(string filename)
{
    ifstream input;
    string line;
    int rnum = 0;
    char delim;
    int rsize;
    input.open(filename);
    if (input)
    {
        while (!input.eof())
        {
            getline(input, line);
            delim = line.find(DELIM);
            readFile[rnum].studentN = line.substr(0, delim);
            line = line.substr(delim + 1, line.length() - 1);
            delim = line.find(DELIM); // moving on to firstname by finding delim.
            readFile[rnum].firstname = line.substr(0, delim);
            line = line.substr(delim + 1, line.length() - 1);
            delim = line.find(DELIM);                        // moving on to lastname by finding delim.
            readFile[rnum].lastname = line.substr(0, delim); // last name
            line = line.substr(delim + 1, line.length() - 1);
            delim = line.find(DELIM);
            readFile[rnum].answers = line; // line = line.substr(delim + 1, line.length() - 1);
            rnum++;
        }
    }
    rsize = rnum;
}
void GradeCalc::gradeCalculation()
{ // once done with reads move to calculations of how many answers were right etc.
    int rnum = 0;
    int rsize = 0;
    string answers = readFile[0].answers;
    int aSize = answers.size();
    for (int i = 0; i < rsize; i++)
    {
        int score = 0;
        for (int t = 0; t < aSize; t++)
        {
            if (answers[t] == readFile[i].answers[i])
                score++;
            {
                answers[i] = score;
            }
        }
    }
}
void GradeCalc::grade()
{
    string line;
    int rnum = 0;
    int aSize = line.length();
    int choices{};
    int rsize = 0;
    int grade{};
    for (int i = 0; i < rsize; i++)
    {
        int score = 0;
        readFile[i].answers = choices;
        readFile[i].percent = grade;
        readFile[i].percent = (choices / aSize * 100);
        if (grade >= 90)
            readFile[rnum].firstname = "A";
        else if (grade > 80 && grade < 90)
            readFile[rnum].firstname = "B";
        else if (grade > 70 && grade < 80)
            readFile[rnum].firstname = "C";
        else if (grade < 70)
            readFile[rnum].firstname = "F";
        cout << "student" << readFile[rnum].firstname << " " << readFile[rnum].lastname << " had "
             << readFile[i].answers << " out of " << aSize << "and has a grade of" << grade << endl;
    }
}