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Please post the question and some code that shows what you are asking about.
The title makes no sense.
What is the difference between instant variable and instance variable?
Where did you see the term: instant variable? I've never seen it.
What does google return for "instant variable"?
I have seen it in our book.
Look in the book's index or ask google.
Instance variable is a variable defined in the class also known as the class variable. And i guess you meant to say constant instead of instant?
So I think it is wrong in the book.