How to solve this?

Question

Written this program, getting the same error again and again. I need someone's help in what this error means and how to rectify it.
https://code.sololearn.com/cc0Z8g6KS1n6/?ref=app

Answer 1

https://code.sololearn.com/cUoPn68BvvcX/?ref=app
Mayur Gowda Here, you had missed the Constructors, that's why you were not able to assign the width.
Look at my code.
I got it fixed for you.

Answer 2

Mayur Gowda , you need constructors for classes Circle and Square.

Answer 3

Ahh I see, thanks a lot Dheeraj Kumar, TheWh¡teCat 🇧🇬 and Царь СОБАКА - Догго I. Much appreciated for the help.