Thread: Vectors:

I am trying to make a grade book and using a vector to get the grades. I am getting errors all over and I figured this would happen because this is the first time I ever used vectors.

Code:

 
#ifndef ___2B__Homework__LetterGrade__
#define ___2B__Homework__LetterGrade__

#include <iostream>
#include <vector>

using namespace std;

class GradeBook {
    
public:
    void getGrades()
    {
        int numGrades=0;
        int checker;
        
        cout<< " Enter the students Grades and Enter -1 to stop. "<<endl;
        
        while (checker != -1) {
        cin>>checker;
        ++numGrades;
            
        vector<int> grades(numGrades);
            for (int i =0; i<numGrades; ++i) {
                cin>>grades[i];
                
                averageGrades(grades[i],numGrades);
            }
        }
    
    }
    
    double averageGrades(int grades[],int num)
    {
        double total;
        double average;
        
        for (int i=0; i<num; ++i) {
            total += grades[i];
        }
        
        average = total / num;
        
        return average;
    }
    void letterGrade()
    {
        
    
    }
    
private:
    
    
};

#endif