#include <iostream>
#include <exception>

int main()
{

try{
    double total(0.0);
    double value(0.0);

    int count(0);

    do{
        std::cout << "Type in a number. ";
        std::cout << "(A Value greater than 9999 ends the program) ";
        std::cin >> value;

        if(not std::cin)
        throw std::exception();

        if(value > 9999) break;
        ++count;

        total+= value;
    }while(true);

    if(count == 0)
    throw std::exception();

    std::cout << "The arithmetic mean of the number input is " << total/count << '\n';
}

catch(...)
{
    std::cerr << "***An exception was thrown.***\n";
}

}