Grading Calc

#include <iostream>
#include <string>
#include <limits>
#include <cmath>
#include <iomanip>
#include <fstream>

using namespace std;

void gradeCalc(int studentID, double midterm, double finalExam, double researchPaper, double groupProject, double participation, double studentAvg);
void printGrade(int studentID, double midterm, double finalExam, double researchPaper, double groupProject, double participation, double studentAvg);

int main()
{
    int studentID;
    double midterm;
    double finalExam;
    double researchPaper;
    double groupProject;
    double participation;
    double studentAvg;

    gradeCalc(studentID, midterm, finalExam, researchPaper, groupProject, participation, studentAvg);
    printGrade(studentID, midterm, finalExam, researchPaper, groupProject, participation, studentAvg);

    return 0;
}

void printGrade(int studentID, double midterm, double finalExam, double researchPaper, double groupProject, double participation, double studentAvg)
{

    ifstream infile;
    ofstream outfile;

    infile.open("grades.dat");
    outfile.open("grades.txt");
    outfile << "STUDENT GRADING REPORT: ";
    outfile << fixed << showpoint << setprecision(2);

    while (!infile.eof()) {

        infile >> studentID >> midterm >> finalExam >> researchPaper >> groupProject >> participation;

        if (studentID > 1 && studentID <= 999) {

            outfile << endl
                    << "Student ID: " << studentID << ' ' << "Midterm: " << midterm << ' ' << "Final Exam: " << finalExam << ' ' << "Research Paper: " << researchPaper << ' ' << "Group Project: " << groupProject
                    << "Participation: " << participation << ' ' << "Student Average: " << studentAvg;
        }
    }

    infile.close();
    outfile.close();
};

void gradeCalc(int studentID, double midterm, double finalExam, double researchPaper, double groupProject, double participation, double studentAvg)
{

    //midterm = .25
    //finalExam = .25
    //researchPaper = .20
    //groupProject = .20
    //participation = .10

    ifstream infile;
    ofstream outfile;

    infile.open("grades.dat");

    while (!infile.eof()) {

        infile >> studentID >> midterm >> finalExam >> researchPaper >> groupProject >> participation;
        studentAvg = ((midterm * .25) + (finalExam * .25) + (researchPaper * .20) + (groupProject * .20) + (participation * .10));

        if (studentID > 1 && studentID <= 999) {

            cout << endl
                 << fixed << showpoint << setprecision(2) << "Student ID: " << studentID << ' ' << "Average:  " << studentAvg;
        }
    }

    infile.close();
};