Q$\mathrm{.}2$: Write a function receiving one number as an input argument. It will use the menu function

to display 'Choose a function' and have buttons labeled 'fix', 'floor', and 'abs'. Using a switch

statement, the function will then calculate and return the requested function $($e$.$g$.,$ if 'abs' is chosen,

the function will return the absolute value of the input argument$).$ Choose a fourth function to

return if the user clicks on the red $\text{'}x\text{'}$ instead of pushing a button.

Q$\mathrm{.}3$: Prompt the user for a character vector, and then print either the character vector that the user

entered or an error message if the user did not enter anything.

Q$4$: Write a for loop that will print a column of five $*\text{'}$s$.$