/* An "A-B-C-D-F" Program */ 
#include <iostream.h> 
int main() 
{ 
int x; 
    cout << "Please enter a grade: "; 
    cin >> x; 

    if (x >= 90) 
        cout << "A"<<endl; 
    else if (x >= 80) 
        cout << "B" << endl; 
    else if (x >= 70) 
        cout << "C" << endl; 
    else if (x >= 60) 
        cout << "D" << endl; 
    else if (x < 60) 
        cout << "F" << endl; 

return 0; 
}