Write a C/C++ code Problem specification Sophia's Pizzeria sells two sizes of pizzas: medium and large. A medium pizza is $9.99, and a large pizza is $12.99. Periodically, Sophia e-mails customers a $2 coupon on the purchase of a large pizza only. She wants a program that displays the price of a pizza, given the size of the pizza ordered and whether or not the customer has a $2 coupon. Modify the program to allow customers to use a $2 coupon toward the purchase on any size pizza. Modify the program appropriately. Modify the program to allow customers to keep enter the pizza until user type '-1' to exit your program. Modify the program appropriately