Chapter 11, Problem 2P

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.