Chapter 9, Problem 9.5E

(Complex class) Create a class called complex for performing arithmetic with complex numbers. Write a program to test your class. Complex numbers have the form

realpart+imaginarypart * i

where i is $\sqrt{-1}$

Use double variable to represent the private data of the class. Provide a constructor that enables an object of this class to be initialized when it’s declared. The constructor contains default values in case no initializes are provided. Provide public member function that perform the following tasks:

1. Add- Adds two complex numbers: the real parts are adaded together and the imaginary parts are added together.
2. Subtract- subtract two complex numbers: The real part of the right operand is subtracted from the real part of the left operand, and the imaginary part of the right operand is susbtracted from the imaginary part of the left operand.
3. toString: Return a string representation of a complex number in the form (a, b), where a is the real part and b is the imaginary part.

In chapter 10, you’ll learn how to overload +, - aqnd << so you cvan write expressions like a+ b and a- b and cout <<a to add, subtract and output Complex objects. [Note: The C++ Standard Library provides its own class complex-number arithmetic. For information on this class, visit http://en.cppreference.com/w/cpp/numeric/complex.]