3.1. Basics of the Class and Encapsulation

You are required to write a class called Rational to represent rational numbers. The class should have an integer num (numerator) and integer den (denominator) as attributes. You also have to implement these constructors:

Rational (): constructor to initialize the num and den to the value 1.

Rational (int numerator, int denominator): constructor to initialize the rational number given the parameters numerator and denominator. The constructor should make sure that the denominator is different than zero. If denominator is equal to zero, num and den are set to 1. Otherwise, the num must have the value of the numerator divided by the gcd, and the den must have the value of the denominator divided by the gcd. This is known to be the reduced form of a rational number.

Setters and getters for the attributes num and den.