Help C++.

Construct a class named Room that declares two double-precision data members named length and width. Include a constructor that initializes each data member to 1.0, when a room object is created. Add two accessor functions for displaying the length and width values of room object and two mutators functions that allows changing these data member values.

1-Modify the main () function to create a second room with a length of 9 and a width of 12.

2-Add a class function named area() that calculates and display a rooms area.