#include <iostream>
#include <cmath>

using namespace std;

double mean(double arr[], int size);
double range(double arr[], int size);
double stdDev(double arr[], int size);

char ch;
string temp;
int k = 0;
double * data = NULL;

// This assignment is worth 5 points
// +1 for successful implementation of mean
// +2 for successful implementation of range
// +2 for successful implementation of stdDev

int main()
{
	int arr_size;
	cout << "Enter array size: ";
	cin >> arr_size;
	cin.ignore();

	data = new double[arr_size];
	cout << "Enter " << arr_size << " values: ";
	do
	{
		cin >> data[k];
		k++;
		ch = cin.get();
	} while(ch != '\n' && k < arr_size);
	if(ch != '\n' && k == arr_size)
		getline(cin, temp);
	else if(ch == '\n' && k < arr_size)
                for(k; k < arr_size; k++)
                        data[k] = 0;

	cout << "Mean: " << mean(data, arr_size) << endl;
	cout << "Range: " << range(data, arr_size) << endl;
	cout << "Standard Deviation: " << stdDev(data, arr_size) << endl;

	return 0;
}

double mean(double arr[], int size)
{
	double sum = 0;

	for(int i = 0; i < size; i++)
		sum += arr[i];

	return sum/size;
}

double range(double arr[], int size)
{
	double min = arr[0], max = arr[0];

	for(int i = 1; i < size; i++)
	{
		if(arr[i] < min)
			min = arr[i];

		if(arr[i] > max)
			max = arr[i];
	}

	return max-min;
}

double stdDev(double arr[], int size)
{
	double avg = mean(arr, size);	// A function can call other functions
	double sqsum = 0;

	for(int i = 0; i < size; i++)
	{
		sqsum += pow(arr[i] - avg, 2);
	}

	return sqrt(sqsum/size);
}