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self test examples doubt

+Pie Number of slices to send: Send
I have some doubts from the book HFSJ, chapter:10, self test examples 3, 9 & 15.
I don't understand the answers given in the book. Because they don't explain the answers. Can anyone please explain?
Also I have found some examples's topics are not in the book but they are in the specification. Do I need to read the spec?
+Pie Number of slices to send: Send
 

Also I have found some examples's topics are not in the book but they are in the specification.


You have to read this tutorial on Dynamic Attributes.

Do I need to read the spec?


Not necessarily. But I'd recommend to refer to it as much as you can whenever you have any doubt, or whenever you want to know more about a certain topic.
What I don't understand is how they changed the earth's orbit to fit the metric calendar. Tiny ad:
a bit of art, as a gift, that will fit in a stocking
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