$1.$ Write a C$++$ program that does the following:

a$.$ Create a C$++$ file with the name problem$4.$cpp$.$

b$.$ Prompt the user to enter the price of his$/$her items.

c$.$ The user can enter as many items as he$/$she wants until the user enters the integer $0.$

d$.$ Print out the total of his$/$her checkout.

e$.$ If the sum is greater than $$100,$ print out That's expensive!

Sample run of the program:

Enter the price of an item $($enter $0$ to stop$)$: $27$

Enter the price of an item $($enter $0$ to stop$)$: $80$

Enter the price of an item $($enter $0$ to stop$)$: $0$

Your checkout total is $$107.$That$\text{'}$s expensive!