[c-prog] Please Help

[Chris]

I need to figure out what is wrong with this. I need the average of 
the scores to be calculated in the AverageGrade function, but I am 
having problems. Can someone help me?

#include <iostream>
#include <cstdlib>
#include <cmath>

using namespace std;

class Person
{
protected:
        char m_FirstName[30];
        char m_LastName[30];
public:
        void SetFirstName(char []);
        char * GetFirstName(void);
        void SetLastName(char []);
        char * GetLastName(void);
};

class Student : public Person
{
protected:
        char m_NID[30];
        float m_Grade;
public:
        void SetNID(char []);
        char * GetNID(void);
        void SetGrade(float);
        float GetGrade(void);
};

float AverageGrade(Student [], int);
//int MaximumGradeStudent(Student [], int);

void main()
{
    Student *studentInfo;
    char studentFName, studentLName, studentNID;
    float studentGrade;
    int i,n;

    cout << "Enter the number of students: ";
    cin  >> n;

        studentInfo = new Student[n];

    for (i = 0;i < n; i++)
    {
        cout << "\nStudent #" << i+1 << endl;
        cout << "Enter the student's first name: ";
        cin  >> studentFName;

                cout << "Enter the student's last name: ";
        cin  >> studentLName;

                cout << "Enter the student's NID: ";
        cin  >> studentNID;

        cout << "Enter the student's grade:     ";
        cin  >> studentGrade;

                studentInfo[i].SetFirstName(&studentFName);
                studentInfo[i].SetLastName(&studentLName);
                studentInfo[i].SetNID(&studentNID);
                studentInfo[i].SetGrade(studentGrade);
        }

}

float AverageGrade(Student studentGrade, int average)
{
    int i;
        float n;
        float AveSco = 0.0;
    bool validString = true;

        for(i=0;i<n;i++)
    {
        AveSco = AveSco + n;
    };
    AveSco = AveSco / n;
        cout << "The average student grade is: " << AveSco << endl;   
        return AverageGrade;
};