/*--------------------------------------------------
 File: crunchGrades.cpp
 Name: Sharon M. Tuttle
 last modified: 5-3-05

 Contract: main : void -> int

 Purpose: allow user to conveniently "crunch", or see
          some information about, an array of grades
          of his/her choice, that he/she enters interactively
          when prompted. The user can keep requesting
          functions to be run until he/she enters q to
          quit.

 Examples: when the user starts this, he/she will be
           prompted for a number of grades desired, and
           then for that many grades. For example, he/she
           might answer 5, and then type in the grades:
           90.9, 78.1, 82.3, 95, 88.8

           After that, the following menu of options should 
           be printed to the screen:

What do you want done with these grades? 
-------------------------------------------
Enter:    To see:
------    -------
 1        the average of these grades
 2        how many grades are passing grades
 3        the highest grade
 4        the lowest grade

 q        to quit the program

Your choice: 

           If the user types in 1, 2, 3, or 4, then 
           the specified computation will be done,
           and the result printed in a message to the
           screen.

           For example, if the user typed the grade
	   information above, and then typed 4 at this
           point, then the following message would
           be printed to the screen:

the lowest grade: 78.1

           If user types q, the program will quit; if 
           user types anything else, it will complain
	   and ask him/her to try again.
-----------------------------------------------------*/

#include <iostream>
#include "countPassing.h"
#include "avgGrade.h"
#include "minGrade.h"
#include "maxGrade.h"
using namespace std;

int main()
{
    // local variables
    int   desiredSize;
    char  user_choice;

    // desired sentinel value
    const char SENTINEL = 'q';

    // let's format the function results nicely...
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(2); 

    cout << "how many grades? ";
    cin >> desiredSize;
    cout << endl;

    double gradeArray[desiredSize];

    for (int i = 0; i < desiredSize; i++)
    {
        cout << "enter grade #" << (i+1) << ": ";
        cin >> gradeArray[i];
    }

    // ask user what he/she wants next for these grades
    cout << endl;
    cout << "What do you want done with these grades?" 
         << endl;
    cout << "-------------------------------------------" 
         << endl;
    cout << "Enter:    To see:" << endl;
    cout << "------    -------" << endl;
    cout << " 1        the average of these grades" << endl;
    cout << " 2        how many grades are passing grades" 
         << endl;
    cout << " 3        the highest grade" << endl;
    cout << " 4        the lowest grade" << endl;
    cout << endl;
    cout << " q        to quit the program" << endl;
    cout << endl;
    cout << "Your choice: ";
    cin >> user_choice;

    // run user-chosen grades function until he/she enters
    //     that he/she wishes to quit
    while (user_choice != SENTINEL)
    {
        if (user_choice == '1')
        {
            cout << "the average grade: "
                 << avgGrade(gradeArray, desiredSize) 
                 << endl;
        }
        else if (user_choice == '2')
        {
            cout << "# of passing grades: "
                 << countPassing(gradeArray, desiredSize) 
                 << endl;
        }
        else if (user_choice == '3')
        {
            cout << "the highest grade: "
                 << maxGrade(gradeArray, desiredSize) 
                 << endl;
        }
        else if (user_choice == '4')
        {
            cout << "the lowest grade: "
                 << minGrade(gradeArray, desiredSize) 
                 << endl;
        }

        // not a function choice? Complain!
        else
        {
            cout << user_choice 
                 << " is not one of the choices;"
                 << " please try again." << endl;
        }

        // find out user's next function to run (if any)
        cout << endl;
        cout << "Your next choice: ";
        cin >> user_choice;
    }

    return EXIT_SUCCESS;
}