C++ These are simple few lined programing questions. When writing the code, please comment explaining what each parts do. Please write in c++

Write the C++ code that reads an integer from the user named input. The integer is then passed to a function named absolute Value as a pointer and the value of input is updated. Do not pass by reference, pass a pointer. The absolute value of a number x is defined as x = X if x 20 -x otherwise - Write a void function using two type integer call-by-reference parameters that outputs the following: The output is: 6, 12, 18, 24. Be sure to include testable pre- and post-conditions. Write a class definition for a table. It should have table name, material, length, and width. Include the mutator and accessor functions for these member variables. Write an overloaded function called sum. The first function should accept two doubles and adds them together. The second function should accept three doubles and adds them together