In Magento 2, how do we show prices in other currencies than the base currency rounded up?
You can create another store view and set a different currency (and language if you want but this isn't mandatory).
Then you can set the base currency and the converstion rate.
Here's the official documentation: http://docs.magento.com/m2/ce/user_guide/stores/currency-overview.html
Thanks for your message, but I'm asking specifically about currency rounding. For example, when foreign currencies are calculated using today's exchange rate, the price may be shown as $14.40. I want that to show as $15. How do I do that?
Sorry, my bad.
I'm not sure that you can achieve that behavior just by configuration. (I'm pretty sure that you won't get it at least you change code).
This won't be just a visual change. You'll need to apply the round up everywhere becasu the payment gateways, ,etc ,etc.
I have no idea but I guess that you shold start to investigate inside Magento\Directory\Model\PriceCurrency or somewhere near there.