// 
//  Introduction to while loops
//
//  Determine passing / failing grade
//

#include <iostream>
#include <iomanip>
using namespace std;

int main ()
{

// ---- Variables

int
    grade,            // grade to be input
    gradesum = 0,     // sum of grades
    gradecount = 0;    // how many grades

float
   avg;           // average of grades

// ---- Input

cout << "\nEnter your first integer grade (-1 to quit)--> ";
cin >> grade;

// ---- Processing loop

while (grade >= 0)
{
   if (grade >= 60)
      cout << "\nGrade " << grade << " is passing\n";
   else
      cout << "\nGrade " << grade << " is failing\n";

   gradesum += grade;
   gradecount ++;

   cout << "\nEnter your next integer grade (-1 to quit)--> ";
   cin >> grade;
}

avg = static_cast<float> (gradesum)/gradecount;

cout << "\nNum of grades : " << gradecount;
cout << "\nSum of grades : " << gradesum;
cout << "\nAvg of grades : " << avg;

cout << "\n\n";
return 0;

}