// Fig. 21.11: fig21_11.cpp 
// Stream-extraction operator returning false on end-of-file. 
#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main()
{
   int grade, highestGrade = -1;

   cout << "Enter grade (enter end-of-file to end): ";
   while ( cin >> grade ) {
      if ( grade > highestGrade )
         highestGrade = grade;
  
      cout << "Enter grade (enter end-of-file to end): ";
   } // end while

   cout << "\n\nHighest grade is: " << highestGrade << endl;
   return 0;
} // end function main




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