Grade Reporter

#include <iostream>
#include <string>
using namespace std;

double CalcAverage(double t1, double t2)
{
    double avg;
    avg = (t1 + t2) / 2.0;
    return(avg);
}

char GradeConvert(double avg)
{
    char grade;
    if(avg >= 90){
        grade = 'A';
    }
    else if(avg >= 80){
        grade = 'B';
    }
    else if(avg >= 70){
        grade = 'C';
    }
    else if(avg >= 65){
        grade = 'D';
    }
    else{
        grade = 'F';
    }
    return(grade);
}

void PrintRecord(string course, string name, double num, char letter)
{
    system("cls");
    cout << "Course: " << course << endl;
    cout << "\n    Student: " << name << endl;
    cout << "    Numeric Average: " << num << endl;
    cout << "    Letter Grade: " << letter << endl;
    cout << "\n";
    system("pause");
}

int main()
{
    string c, n;
    double t1, t2, a;
    char l, r;
    do{
        system("cls");
        cout << "Enter course: ";
        getline(cin, c);
        cout << "Enter name: ";
        getline(cin, n);
        cout << "Enter midterm and finals grades:" << endl;
        cin >> t1;
        cin >> t2;
        a = CalcAverage(t1, t2);
        l = GradeConvert(a);
        PrintRecord(c, n, a, l);
        cout << "\nWould you like to enter another course(y/n): ";
        cin >> r;
        cin.ignore();
    }while(r == 'y');
    return(0);
}