计算average score

#include<iostream>
using namespace std;
int main(){
    char continueProgram = 'y';
    while(continueProgram == 'y'||continueProgram == 'Y'){
        float score1, score2, score3, average;
        char grade;
        cout << "Enter the first team score: ";
        cin >> score1;
        cout << "Enter the second team score: ";
        cin >> score2;
        cout << "Enter the third team score: ";
        cin >> score3;

        average = (score1 + score2 + score3) / 3;

        if (average >=90){
            grade = 'A';
        }
        else if (average >=80){
            grade = 'B';
        }
        else if (average >=70)
        {
            grade = 'C';
        }
        else if (average >=60)
        {
            grade = 'D';
        }
        else {
            grade = 'F';
        }

        cout << "Average score: " << average << endl;
        cout <<"Grade: " << grade << endl;

        cout<<"Do you want to calculate another grade? (y/n): ";
        cin >> continueProgram;
    }
    cout << "Thank you for using the Grade Calculator. Goodbye!" << endl;
    return 0;
}