Create a $C++$ program called lab$1\_2.$cpp that simulates a vending machine. In this program, you have to use two functions $($menu and pay$)$ to achieve this task. A sample run of your program might look like this.

Welcome to the Hartnell Vending Machine

Insert money: $$10$

Today's Menu

A$.$ Regular coffee: $($$$3)$

B$.$ Regular decaf: $($$$2)$

C$.$ Combo: $($$$5)$

D$.$ Soda: $($$$1)$

Select your choice: A

You selected regular coffee.

Your change is: $$7\mathrm{.}00$

Have a nice day!