Instructions

In this exercise you're going to write some code to help Betty's Bike Shop, an online shop for bikes and parts. You have three tasks, aiming at correctly displaying the bikes and parts prices on the website.

1. Export the penceToPounds function

Your colleague has already written the skeleton of the module, the undefined functions penceToPounds and poundsToString. However, they have forgotten to export the penceToPounds function, so it is currently not visible by other modules or by the test suite.

Add penceToPounds to the list of exported functions.

2. Convert pence to pounds

Currently, the price is stored as an integer number of pence (the bike shop is based in the UK). On the website, we want to show the price in pounds, where 1.00 pound amounts to 100 pence. Your second task is to implement the penceToPounds function, taking an Int amount of pence, and converting it into its equivalent pounds as a Float. You should also define the type annotation for that function.

3. Format the price for display on the website

Since Betty's bikes are sold in pounds, prices should be displayed with the symbol "£". Your third task is thus to implement the poundsToString function, taking an amount of pounds as a Float and returning its price displayed as a String with the pound symbol prepended. The String module contains the String.fromFloat function that will be helpful for this. You should import the String module before using it. You should also define the type annotation for poundsToString.