# include <cstdlib>
# include <iostream>

using namespace std;

int main ( )
//
//  AVERAGE allows the user to enter an average, presumably
//  between 0 and 100, and prints out the corresponding letter grade.
//
//  This is a simple example of the use of a CHAR variable to store
//  a single character.
//
{
  float average;
  char grade;

  cout << "Enter your average, between 0.0 and 100.0: ";
  cin >> average;

  if ( 90.0 <= average )
  {
    grade = 'A';
  }
  else if ( 80.0 <= average )
  {
    grade = 'B';
  }
  else if ( 70.0 <= average )
  {
    grade = 'C';
  }
  else if ( 60.0 <= average )
  {
    grade = 'D';
  }
  else
  {
    grade = 'F';
  }
  cout << "\n";
  cout << "Based on your average of " << average 
       << ", your grade is \"" << grade << "\".\n";

  return 0;
}