evenOdd.cpp

#include <iostream>
using namespace std;

int sumArray (int oddEven[], int arraySize);

int main ()
{

    int array_size = 0;
    int evenOdd [array_size];

    cout << "Enter the size of the array you wish to create: ";

    while (!(cin >> array_size))
    {
        cin.clear();
        cin.ignore(1000, '\n');
        cout << "\nPlease enter a valid integer: ";
    }

    for(int count = 0; count < array_size; count++)
    {
        cout << "\nPlease enter the value of the element at position " << count << ": ";

        while (!(cin >> evenOdd[count]))
        {
            cin.clear();
            cin.ignore(1000, '\n');
            cout << "\nPlease enter a valid integer: ";
        }
    }

    cout << "\n\nThe result of the sum of the even values minus the sum of the odd values is ";
    cout << sumArray(evenOdd, array_size) << ".\n\n";

    return 0;
}

int sumArray (int oddEven[], int arraySize)
{
    int result;
    int sumEven = 0;
    int sumOdd = 0;
    int count;

    for(count = 0; count < arraySize; count++)
    {
        if((oddEven[count] % 2) == 0)
            sumEven += oddEven[count];

        else
            sumOdd += oddEven[count];
    }

    result = sumEven - sumOdd;

    return result;
}