void main()
void main()
{ int grade;
cout << "enter the grade:" << endl;
cin >> grade;
if ( grade >= 80 )
cout << "A" << endl;
else if (grade >= 70 )
cout << "B" << endl;
else if ( grade >= 60 )
cout << "C" << endl;
else if (grade >= 50 )
cout << "D" << endl;
else cout << "FAIL" << endl;}