Suppose you want to change the implementation of the class Digital-

Time given in Displays 12.1 and 12.2. Specifically, you want to change

the way the time is recorded. Instead of using the two private variables

hour and minute, you want to use a single (private) int variable, which

will be called minutes. In this new implementation the private variable

minutes will record the time as the number of minutes since the time

0:00 (that is, since midnight). So 1:30 is recorded as 90 minutes, since it

is 90 minutes past midnight. Describe how you need to change the

interface and implementation files shown in Displays 12.1 and 12.2.

You need not write out the files in their entirety; just indicate what

items you need to change and how, in a very general way, you would

change them.