How do you nest procedures in Karel?

Nesting procedures in Karel can be done by calling one procedure from within another procedure. This allows for modular programming, where complex operations can be broken down into smaller, reusable components. By calling a procedure inside another, you can achieve a structured and organized codebase that enhances readability and maintainability.

For example, if you have a procedure that collects beeper and another that navigates to a different location, you could call the navigation procedure inside the collecting procedure. This way, whenever you want to collect beepers, the robot will automatically know how to navigate before it starts collecting, creating a more efficient sequence of actions.

The other options do not accurately capture the concept of nesting procedures. Invoking a procedure in the main method does not illustrate nesting. Defining sub-procedures directly inside each other is not supported in Karel, as the language typically does not allow for procedures to be declared within other procedures. Linking procedures sequentially without nesting fails to utilize the benefits of the nested approach, limiting the ability to reuse and organize code effectively.