//---------------------------------------------------------
// Filename: FindAvg2.cpp
//
// Purpose: Find the average of a list of values. The
// values are entered by the user.
//
// D. Searls
// Asbury College
// Sep 2006
//---------------------------------------------------------
#include <iostream>
#include <iomanip>
using namespace std;

const int MAXSIZE = 100;

int main()
{
    int numValues;      // Number of values
    int count;          // Number of values processed so far
    double x[MAXSIZE];  // A list of values
    double sum;         // Sum of values
    double avg;         // The arithmetic average
    
    // Get number of scores
    
    do
    {
        cout << "Enter the number of values in the list (up to " << MAXSIZE << "): ";
        cin >> numValues;
        cout << endl;
    } while (numValues > MAXSIZE);
   
    // Read scores
    
    for (count = 0; count < numValues; count++)
    {
        cout << "Enter score " << count + 1 << ": ";
        cin >> x[count];
    }
    cout << endl;
    
    // Calculate average
    
    if (numValues > 0)
    {
        sum = 0.0;
        for (count = 0; count < numValues; count++)
        {
            sum = sum + x[count];
        }
        avg = sum/(double)numValues;
    }
    
    // Display results
    
    if (numValues > 0)
    {
        cout << "Number of scores read: " << numValues << endl;
        cout << "Sum of scores: " << sum << endl;
        cout << fixed << setprecision(2) ;
        cout << "Average score: " << avg;
    }
    else
    {
        cout << "The list contained no scores.";
    }
    cout << endl << endl;
    return 0;
}

//---------------------------------------------------------
// Filename: FindAvg3.cpp
//
// Purpose: Find the average of a list of values. The
// values are entered by the user.
//
// D. Searls
// Asbury University
// Oct 2011
//---------------------------------------------------------
#include <iostream>
#include <iomanip>
using namespace std;

const int MAXSIZE = 100;

//-----------------------------------------------------
// getData
//
// Read a list of values from the keyboard into an array.
// Return the values and the number of values.
//
// Out Parameters: num, arr
//-----------------------------------------------------
void getData(int& num, double arr[])
{
    num = 0;

    // Get number of scores
    
    do
    {
        cout << "Enter the number of values in the list (up to " << MAXSIZE << "): ";
        cin >> num;
        cout << endl;
    } while (num > MAXSIZE);
   
    // Read scores
    
    for (int count = 0; count < num; count++)
    {
        cout << "Enter score " << count + 1 << ": ";
        cin >> arr[count];
    }
    cout << endl;
}

//-----------------------------------------------------
// sum
//
// Given an array of values and the number of values
// in the array, return the sum of the values. If the
// number of values is less than or equal to zero, this
// function will return a value of zero.
//
// In Parameters: size, list
//-----------------------------------------------------
double sum(int size, const double list[])
{
    double sum;
    
    // Calculate average
    
    sum = 0.0;
    for (int count = 0; count < size; count++)
    {
        sum = sum + list[count];
    }
    
    return sum;
}

//-----------------------------------------------------
// mean
//
// Given an array of values and the number of values
// in the array, return the mean value. If the number
// of values is less than or equal to zero, this
// function will return a value of zero.
//
// In Parameters: n, data
//-----------------------------------------------------
double mean(int n, const double data[])
{
    return sum(n, data) / (double)n;
}

//-----------------------------------------------------
// displayReport
//
// Generate a statistical report including the number
// of values in the data set, the sum of the values, and
// and the mean value.
//
// Precondition: num > 0
//
// In Parameters: num, sum, average
//-----------------------------------------------------
void displayReport(int num, double sum, double average)
{
    cout << "Number of scores read: " << num << endl;
    cout << "Sum of scores: " << sum << endl;
    cout << fixed << setprecision(2) ;
    cout << "Average score: " << average;
}

//*********************************************************
//              M A I N   D R I V E R
//*********************************************************

int main()
{
    int numValues;           // number of data values
    double myData[MAXSIZE];  // data values
    
    getData(numValues, myData);
    if (numValues > 0)
    {
        displayReport(numValues, sum(numValues, myData), mean(numValues, myData));
    }
    else
    {
        cout << "The list contained no scores.";
    }
    cout << endl << endl;
    
    return 0;
}