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#include <iostream> #include <iomanip> using namespace std; char Convert (float); int main() { string first, last; int score; int stu_sum = 0; int stu_num_score = 0; float avg; char letter; cout << fixed << showpoint << setprecision(1); cin >> first; while(cin) { cin >> last; // cout << first << " " << last << " "; cin >> score; while(score != -1) { stu_num_score ++; stu_sum += score; cin >> score; } avg = float(stu_sum)/stu_num_score; cout << avg << "\t"; letter = Convert(avg); cout << letter << "\t"; cout << " " << first << " " << last; cout << "\n"; cin >> first; } return 0; } char Convert (float score) // 3. fun definition { char letter; if(score>=90) letter = 'A'; else if(score>=80) letter = 'B'; else if(score>=70) letter = 'C'; else if(score>=60) letter = 'D'; else letter = 'F'; return letter; }