#include <iostream>

int main(int argc, const char*[])
{

    double iChoice;

    // Prompt for user to input numbers.
    std::cout << "Enter a number with decimal points, or press 99 to exit." << std::endl;
    std::cout << "Your number: ";
    std::cin >> iChoice;

    int iNumberOfNumbersEntered = 0;
    double sum = 0;
    try
    {
        // Loop for executing input.
        while (iChoice != 99) // <-- CHECK ICHOICE INITIALLY FIRST BEOFRE YOU EXECUTE THE LOOP
        {
            sum = sum + iChoice;
            std::cout << sum << std::endl;
            std::cout << "Enter another number with decimal points." << std::endl;
            std::cout << "Your number: ";
            std::cin >> iChoice;
            iNumberOfNumbersEntered++;
        }

        //Throw an exception if the number of numbers entered is 0 to avoid a divide by 0 error.
        if (iNumberOfNumbersEntered == 0)
            throw 0;
        // Throw an exception if the number is more than 10 digits long.
        if (iChoice <= -1000000000 || iChoice >= 1000000000)
            throw 1;

        // Average of numbers added.
        sum = sum / iNumberOfNumbersEntered;
        std::cout << "The average for the numbers that you entered is " << sum << "." << std::endl;
    }

    catch (int x)
    {
        if (x == 0)
            std::cout << "You must enter more than one number to calculate an average." << std::endl;
        else if (x == 1)
            std::cout << "Enter a number in the range of 10 digits." << std::endl;
    }
    system("pause");
    return 0;
}