Define two classes A and B each having one integer private data member. Write zero argument and

parameterized constructors to initialize the data member and member functions to get, set and

display the data member for these classes. Write a swap$()$ function which takes the $2$ arguments as

class A and class B objects and exchanges the data members of these two objects. Write a main

function which creates instances of the classes A and B$,$ assigns values to each and swaps the

value of data member of these objects using the swap $()$ function. Display the objects before and

after swapping.