Answer 1

1. You can try yourself in code playground

Firstly, at the lesson, click the Try It Yourself, and go to a template

Change the number to a large one, say 123
Run with %d
Change the to %4d and run
then change to %8d and run

Can you do the above and come back to tell your tested result?

2. In case you cannot work out yourself, here is the result:

https://code.sololearn.com/cF3sk6HZF2n9/?ref=app

It is about formating the output with specific spacing. So the data looks like a table in the console.