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3.3. Exercises

1. Write an equals method for the fraction class that returns true is two fractions are equal and false otherwise.

   // Your code here

2. Write sub, mul, and div for the Fraction class.

   // Your code here

3. Write a class that represents a Rectangle. Your constructor should take a length and a width. Write an area method that returns the area of the rectangle.

   // Your code here

4. Write a class the old way that represents a Rectangle. Your constructor should take a length and a width. Write an area method that returns the area of the rectangle.

   // Your code here

5. Write a class Stack that implements the stack data type, with a push, pop, peek, size, and isEmpty as the methods.

   // Your code here

6. Write a class ``Queue`` that implements the queu data type, with enqueue, dequeue, peek, size, and isEmpty as the methods. // Your code here

7. Write a class Cat that inherits from Animal.

   // Your code here

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