Part $1(10$ pts$)$: Private Variable

Task

Create a class Foo with a private variable x$.$

Add a setter and getter method to access x$.$

Use a setter method $($set$)$ to assign a value to x and a getter method $($get$)$ to retrieve its value.

Demonstrate the functionality with an instance of the class named f$.$

Clarification

The private variable x should not be accessible directly from outside the class.

Use the $\_$ prefix for the private variable $($e$.$g$.,\_$x$)$ to follow convention.

Example: Use f$.$set$(5)$ to assign a value to x$.$