// Chris Alvin
// CS110
// Program 1
// The program simulates a simple grading program.
// Limitations: integer input expected.

#include <iostream.h>
#include <iomanip.h>

// function to print the menu
void printMenu() {
  cout << "Please select the operation which you would like to perform?" << endl;
  cout << "1) Enter scores." << endl;
  cout << "2) Query the current average." << endl;
  cout << "3) Query the current high score." << endl;
  cout << "4) Query the current low score." << endl;
  cout << "5) Clear all data." << endl;
  cout << "6) Exit." << endl;

  return;
}

float average(unsigned int t, unsigned int c) {
  return (float)(t) / c;
}

void printAverage(unsigned int t, unsigned int c) {
  cout << "The current average is ";
  if (c == 0) cout << 0 << endl;
  else if (t % c == 0) cout << (int)(average(t, c)) << endl;
       else cout << average(t, c) << endl;

  return;
}

int main()
{
  cout << setiosflags (ios::showpoint | ios::fixed) << setprecision(2);

  int choice = 1;  // user-input menu
  int num = 0;              // input number
  int high = -1, low = 101; // init to values out of range
  unsigned int count = 0;
  unsigned int total = 0;

  // 6 is the only value that will quit; all other ints acceptable
  while (choice != 6) {

    // call function to print the menu
    printMenu();

    cin >> choice; // switch on menu user input

    switch (choice) {
      case 1:
        cout << "Enter first score." << endl;
        cin >> num;
        while (num >= 0 && num <= 100) {
          if (high < num) high = num;
          if (low > num) low = num;
          count++; 
          total += num;
	  cout << "Enter another score (negative number to stop)." << endl;
          cin >> num;
	}
        break;

      case 2:
        printAverage(total, count);
        break;

      case 3:
        cout << "The current high score is ";
        if (high == -1) cout << "UNKNOWN" << endl;
        else cout << high << endl;
        break;

      case 4:
        cout << "The current low score is ";
        if (low == 101) cout << "UNKNOWN" << endl;
        else cout << low << endl;
        break;

      case 5:
        high = -1;
        low = 101;
        count = 0;
        total = 0;
        cout << "Data cleared." << endl;
        break;

      case 6: break;

      default:
        cout << "ERROR: invalid entry." << endl;
    }
    cout << endl;
  }

  return 0;
}