This is one of those articles interesting to new programmers. The actual answer is that currency is complicated; any small library you will write it likely to

This is one of those articles interesting to new programmers. The actual answer is that currency is complicated; any small library you will write it likely to forget some complication; and, absent new open source you should go commercial. For example, glance over the list of classes in the "money.h++" which was sold decades ago (http://docs.roguewave.com/legacy-hpp/mnyug/2-9.html http://docs.roguewave.com/legacy-hpp/mnyug/2-9.html) TL;DR: The article is Too Long; Don't Read.