Self-Test Exercise 17 asked you to overload the operator >> and the operator << for a class Pairs. Complete and test this exercise. Implement the default constructor, and the constructors with one and two int parameters.

The one-parameter constructor should initialize the first member of

the pair; the second member of the pair is to be 0.

Overload binary operator + to add pairs according to the rule

(a, b) + (c, d) = (a + c, b + d)

Overload operator - analogously.

Overload operator* on Pairs and int according to the rule

(a, b) * c = (a * c, b * c)

Write a program to test all the member functions and overloaded

operators in your class definition.