Review 2: financial example docs

[jzmaddock]

Form the review:

Simple Moving Average

Could we link the moving_average.cpp to the actual file on github?

Please move the file reading into its own function. In the current
implementation main keeps the file open during calculating the average.

Please add text that explains what this example demonstrates and why is it
(better) using decimal floating point than binary. I understand that it shows
how to calculate a moving average, but why do we want to show that? What is
that I need to look for in this example? What is "its point"?

Currency Conversion

Could we link currency_conversion.cpp to the file on github?

I'd recommend direct using declarations not using namespace in examples.

I'd use a user defined literal for the value of exact_eur_amount, people are
more used to seeing currency amounts in decimal form, like 920.46EUR.

Please add text that explains what this example demonstrates and why is it
(better) using decimal floating point than binary. I understand that it shows
calculating currency conversions, but why do we want to show that? What is
that I need to look for in this example? What is "its point"?

Boost.Math Integration

Could we link statistics.cpp to the file on github?

Same comment about keeping the file open while doing the calculations.

I don't get what the exit code of this program means. main returns
mean_closing_price > median_closing_price but I am not a financial programmer
(or a statistical one) so I have no clue what that means. What question does
that answer? What does it mean if the mean is larger than the median? No pun
intended.

Please add text that explains what this example demonstrates and why is it
(better) using decimal floating point than binary. I understand that it shows
how to use Boost.Math, but why do we want to show that? What is that I need
to look for in this example? What is "its point"?