Okay, this has got to be it. It runs and averages. Thanks for sticking with me.

//#include "stdafx.h"
#include <iostream> // I/O operations
#include <iomanip> // Formatting functions
#include <cstdlib> // General use library functions
#include <string> // Defines dynamic string stuff

using namespace std;

int main()
{
    //--------  Start of variable and object creation ------

    string csid = "XXXX";
    string first = "XXXX";
    string last = "XXXX";

    string grade1 = "XXXX";
    string grade2 = "XXXX";
    string grade3 = "XXXX";
    string grade4 = "XXXX";
    string grade5 = "XXXX";
    string grade6 = "XXXX";


    // A variable to throw away the screen transition input

    string resp = "XXXX";

    //--------  End of variable declarations -----------------------

    //--------  Beginning of the Splash Screen   -------------------
    system("cls");  //Calls to the OS using cls  function  MS specific
    cout << endl << endl << endl << endl; //4 blank lines
    cout << "                               " << endl;
    cout << endl << endl;
    cout << "                       " << endl;
    cout << endl << endl << endl << endl << endl << endl; // 6 blank lines
    cout << "                             " << endl;
    cout << endl << endl << endl << endl << endl << endl << endl << endl;

    //--------  End of the Splash Screen  --------------------------

    //Transition to next screen
    cout << "                          Press <ENTER> to Continue";
    getline(cin, resp);
    system("cls");
    //End of transition

//--------  Start of Input Screen  -----------------------------

    cout << endl << endl;
    cout << "                               COLLEGE NAME" << endl;
    cout << endl;
    cout << "                                STUDENT GRADE TRACKING SYSTEM" << endl;
    cout << endl;
    cout << "                                Input Screen" << endl;
    cout << endl;
    cout << "    Enter data as requested and press <ENTER> after each.";
    cout << endl << endl;
    cout << "     Last Name:  "; getline(cin, last);
    cout << "     First Name:  "; getline(cin, first);
    cout << endl;
    cout << "     Student ID Number:  "; getline(cin, csid);

    cout << "     Grade 1:  "; getline(cin, grade1);
    cout << "     Grade 2:  "; getline(cin, grade2);
    cout << "     Grade 3:  "; getline(cin, grade3);
    cout << "     Grade 4:  "; getline(cin, grade4);
    cout << "     Grade 5:  "; getline(cin, grade5);
    cout << "     Grade 6:  "; getline(cin, grade6);

    //--------  End of the Input Screen  --------------------------

        //Transition to next screen
    cout << "                           Press <ENTER> to Continue";
    getline(cin, resp);
    system("cls");
    //End of transition

    double grade1_num = atof(grade1.c_str());
    double grade2_num = atof(grade2.c_str());
    double grade3_num = atof(grade3.c_str());
    double grade4_num = atof(grade4.c_str());
    double grade5_num = atof(grade5.c_str());
    double grade6_num = atof(grade6.c_str());

    double Average = (grade1_num + grade2_num + grade3_num + grade4_num + grade5_num + grade6_num) / 6;

    //--------  Start of Output Screen  -----------------------------

    cout << endl << endl;
    cout << "                               COLLEGE NAME" << endl;
    cout << endl;
    cout << "                                STUDENT GRADE TRACKING SYSTEM" << endl;
    cout << endl;
    cout << "                                Output Screen" << endl;
    cout << endl << endl << endl;
    cout << "     Student Name (First Last):  " << first;
    cout << " " << last << endl;
    cout << "     CSID:  " << csid << endl;

    cout << "     Grade 1:  " << grade1 << endl;
    cout << "     Grade 2:  " << grade2 << endl;
    cout << "     Grade 3:  " << grade3 << endl;
    cout << "     Grade 4:  " << grade4 << endl;
    cout << "     Grade 5:  " << grade5 << endl;
    cout << "     Grade 6:  " << grade6 << endl;
    cout << "     Total Grade Average:  " << Average << endl;

    // Conversions, Decisions and Calculations




    //--------  End of the Output Screen  --------------------------

    //Transition to next screen
    cout << "                           Press <ENTER> to Continue";
    getline(cin, resp);
    system("cls");
    //End of transition

    return 0;
}// int main( )