Library Book
BeginnerProblem Description
Build a Book class with title, author, isbn, and is_available (boolean).
Methods: borrow() and return_book(). Create a small library of books and borrow/return some.
OOP Focus: Object state changes driven by methods.
Note: This is statement-only in the current Practice version; stdout should be empty.
Input & Output Format
INPUT:
Two lines. First line: space-separated numbers for vector a.
Second line: space-separated numbers for vector b.
Second line: space-separated numbers for vector b.
OUTPUT:
A single number (the dot product).
Example
Input:
1 2 3
4 5 6
4 5 6
Output:
32
Explanation: 1×4 + 2×5 + 3×6 = 4 + 10 + 18 = 32
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Output
Run or submit to see output.