#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main()
{
    //declare variables
    double score    = 0.0;
    double totalPoints = 0.0;  //accumulator
    char grade         = ' ';

    //get first score
    cout << "First score (negative number to stop): ";
    cin >> score;
  
    while (score >= 0)
    {
        //add score to accumulator
        totalPoints = totalPoints + score;
        //get next score
        cout << "Next score (negative number to stop): ";
        cin >> score;
    }   //end while

    //assign grade
    if (totalPoints >= 360)
        grade = 'A';
    else if (totalPoints >= 320)
        grade = 'B';
    else if (totalPoints >= 280)
        grade = 'C';
    else if (totalPoints >= 240)
        grade = 'D';
    else grade = 'F';
    //end ifs

    //display total points and grade
    cout << "totalPoints: " << totalPoints << endl;
    cout << "Grade: " << grade << endl;

    return 0;
}   //end of main function

cout << "First score (negative number to stop): ";
cin >> score;

char confirm = 'n';

if (score > 100) {
     cout << "Is this score correct? (y/n): ";
     cin >> confirm;
}

// more code here