Help with switch statements

Question

Insert the extra functions into the declarations and create a switch statement
(full instructions in comments)

https://code.sololearn.com/c80CC9Sz3Auu/?ref=app

Answer 1

This is the updated code:
https://code.sololearn.com/cP149AhHP5gH/#cpp

As the input, I used:
3
1
2
9