#include <iostream> using namespace std; // here we use flag method to count the average grade int main() { bool seenEndofInput; int numofStudents, sum; int curr; double average; cout << "Write grades by separated space" << endl; cout << "End of grades by typing -1" << endl; numofStudents = 0; sum = 0; seenEndofInput = false; while (seenEndofInput == false) { cin >> curr; if (curr == -1) { seenEndofInput == true; } else { sum += curr; numofStudents++; } } average = (double)sum / (double)numofStudents; cout << "The class average grade is " << average << endl; return 0; }