This is for C++ class PLEASE I need help! I do not undestand this.

a. Construct a class named Rectangle that has two double-precision data members named length and width. The class should have the following class functions:

i. A constructor with the default values of 1 for both the length and width data members

ii. An accessor function named showData() that displays a rectangles length and width

iii. A mutator function named setData() to set a rectangles length and width iv. A class function named perimeter() that calculates and displays a rectangles perimeter

v. A class function named area() that calculates and displays a rectangles area

b. Include the Rectangle class constructed in Exercise 5a in a working C++ program.