DWORD ApproximateExampleThree(){
    double stepSize = 0.0;
    double tResult = 0.0;
    double mResult = 10000.0;
    double iterator = 10000.0;
    double preciseValue = log(pow(10.0, -6))/(-1.0/500.0);

    fflush(stdin);
    _tprintf(_T("Approximating equation [m' = -(m/V)*v], where V = 1000 m^3, v = 2 m^3/s.\n"));
    _tprintf(_T("Please enter size of the step [#.#]: "));
    _tscanf(_T("%lf"), &stepSize);

    if(stepSize <= 0){
        _tprintf(_T("Size of the step can't be zero or negative! Aborting... \n"));
        return ERROR_INVALID_PARAMETER;
    }

    for(iterator; iterator > 1.0/100.0; iterator -= stepSize){
        tResult = tResult + stepSize;
        mResult = mResult + stepSize*(-mResult/500.0);
    }

    _tprintf(_T("\nPrecise result is: %.10f seconds.\n"), preciseValue);
    _tprintf(_T("Approximate result is: %.10f seconds\n"), mResult);
    _tprintf(_T("Approximation error is: %.2f%%"), (fabs(preciseValue - mResult)/fabs(preciseValue))*100);

    return ERROR_SUCCESS;
}