Help with Exercise 92 - Object Oriented Programming 1

[AZ]

Hi,

I'm having problems with week 5 exercise 92.

I have completed the first part but I need help on making the method more accurate.

How do I calculate the difference more accurately for the second part of the exercise?

The link to my work is here: http://paste.mooc.fi/3771e7da

Best regards

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[ljleppan]

Hi,

Consider a method call first.differenceInYears(second) where first and second are MyDate objects.

We have three general cases:

1. Both dates are equal

2. first is before second

3. second is before first

Case #1 is trivial so we skip that. We also notice that cases #2 and #3 are essentially the same, with just the dates inverted. So if we can solve one of those, we know how to solve the other. So let us focus on case #2.

NB: I'll be using the format year/month/day, so 2015/1/2 is January 2nd, 2015.

Let us consider a few sub-cases in the format day.month.year, so :

1. first = 2014/1/2, second = 2015/1/1

2. first = 2013/1/2, second = 2015/1/1

3. first = 2013/1/1, second = 2015/1/2

In sub-case #1, the difference is 0 full years, in #2 it's 1 full year and in #3 it is 2 full years.

I'd like you to write those dates down on paper and figure out the pattern there.

I'll give you one more hint: Sometimes, the correct answer is (first.year - second.year - 1) and sometimes it is just (first.year - second.year).

If you need more help, do not hesitate to ask :)

Yours,

Leo