Modify the pizza.cpp (SEE ATTACHED) program in the following manner
Create a value-returning function that returns the cost of each size pizza
costSmall = getCost();
the function will get the cost from the user and return it
repeat for each size
Create a value-returning function that calculates the cost of all of the pizzas sold in each size
totCostSmall = calcCost(costSmall, numSmall);
repeat for each size
SAVE AS HOMEWORK4
