Problem Set 6

CMP 326: Programming Methods II
Lehman College, City University of New York
Fall 2012

This problem set covers Chapter 5.

Item Sales (5 points)

(Exercises #6, Page 358) Consider a class that keeps track of the sales of an item. An object of this class will have the attributes:

• Number Sold
• Total Sales (In Dollars)
• Total Discounts
• Cost per item
• Bulk Quantity
• Bulk discount percentage

And the following methods:

• registerSale(n) Records the sale of n items. If n is equal to or larger than the bulk quatity, the cost per item will be reduced by the bulk discount.
• displaySales() Displays the number sold, the total sales, and total discount.

Implement the class in Java and write some Java code to test the class.

Name these programs ItemSales & ItemSalesDemo

Motor Boat (5 points)

(Exercises #7, Page 359) Consider the class MotorBoat that represents motorboarts. A motorboat has attributes for:

• The capacity of the fuel tank
• The amount of fuel in the tank
• The maximum speed of the boat
• The current speed of the boat
• The efficiency of the boat's motor
• The distance traveled

The class has the following methods:

• Change the current speed of the boat
• Operate the boat for an amount of time at the current speed
• Refuel the boat with some amount of fuel
• Get the amount of fuel in the tank
• Get the distance traveled so far

If the boat has efficiency e, the amount of fuel used when traveling at a speed s for time t is (e * (s^2) * t). The distance traveled in that time is (s * t).

Implement the class in Java and write some Java code to test the class.

Name these programs MotorBoat & MotorBoatDemo