Final answer:
Notes or comments are used in programming to provide additional information about code, but whether they should be applied to all codes under a heading depends on the coding style and requirements of the project.
Step-by-step explanation:
In programming, notes or comments are used to make the code more readable and provide additional information about what the code does. They are typically written in human language and are not executed as part of the program. In some coding styles, it is recommended to include comments for all codes located under a heading to provide clarity and organization.
For example, if you have a function that performs a specific task, it can be helpful to include a comment explaining the purpose of the function and any important details to consider when using it. This makes the code easier to understand for both the original developer and other programmers who might work with the code later.
However, it is not a strict rule that notes must be applied to all codes under a heading. It depends on the coding style and the specific requirements of the project or organization. Some developers prefer to keep their code as concise as possible and only include comments where they are necessary to explain complex logic or potential pitfalls.