Write the implementation of a Complex class in C++ that has the following member functions:

1-constructor that initializes the complex number by default arguments

2-set function that sets the real part of the complex number

3-set function that sets the imaginary part of the complex number

4-get function that returns the real part of the complex number

5-get function that returns the imaginary part of the complex number

6-a function that displays the complex number

7-A member function to get the sum of two or more complex numbers

8-A non-member function to get the sum of two or more complex numbers