How to make programming by using nested

Answer 1

Nested what?
Nested loop?
Nested switch?
Nested if-else?

Or something else?

Answer 2

If it's nested loop, I hope this code should help you.
https://code.sololearn.com/cpZASb23I6Jd/?ref=app

Answer 3

if , elsr

Answer 4

sory if, else