Swapping Private data of classes

CASE 1:

Given two numbers a & b, swap these two numbers using the friend function of C++.

Examples:

Input : a = 5, b = 9
Output : a = 9, b = 5

Input : a = 4, b = 6
Output : a= 6, b = 4

Approach:
Create a class Swap, declare one variable in it, i.e., num, and create a constructor for inputs. Declare a friend function in it. Define the friend function outside the class scope by taking arguments as call by reference to pass the copy of Swap Object. Perform the swap operation.

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