CSCI A201/A597

Problem Set Three

Second Summer 2000

Your problem will be randomly distributed to you by logging in to QuizSite. Due date is Tue Jul 4 11:59pm. Solutions to be posted here Wednesday July 5, at noon.

1. Write a program that asks for an initial balance amount. Create a BankAccount object with that amount. Then ask for a deposit amount and a withdrawal amount. Carry out the deposit and withdrawal, then print the remaining balance.

2. Implement a class Employee. An employee has a name (a string) and a salary (a double). Write a default constructor, a constructor with two parameters (name and salary), and methods to return the name and salary. Write a small program to test your class.
3. Implement a class Employee. An employee has a name (a string) and a salary (a double). Write a default constructor, a constructor with two parameters (name and salary), and methods to return the name and salary. Write a small program to test your class. Enhance the class by adding a method
raiseSalary(double byPercent)
that raises the employee's salary by a certain percentage. Sample usage: 
Employee harry = new Employee("Hacker, Harry", 55000);
harry.raiseSalary(10); //Harry gets a 10% raise
4. Implement a class Car with the following properties. A car has a certain fuel efficiency (measured in miles per gallon or liters per km -- pick one) and a certain amount of fuel in the gas tank. The efficiency is specified in the constructor,and the initial fuel level is 0. Supply a method drive that simulates driving the car for a certain distance, reducing the fuel level in the gas tank, and methods getFuelLevel, returning the current fuel level, and tank, to tank up. Sample usage: 
Car myBeemer = new Car(29); // 29 miles per gallon 
myBeemer.tank(20); // tank 20 gallons 
myBeemer.drive(100); // drive 100 miles 
System.out.println(myBeemer.getFuelLevel());
// print fuel remaining
5. Change the purse program Coins6 to ask the user to supply coins in a different currency. For example, you can use the following collection of German coins: 
new Coin(0.01, "Pfenig");
new Coin(0.1, "Groschen"); 
new Coin(1.0, "Mark");
What changes did you have to make? What changes would you have to make to the Coins4 program to change the currency? Which is easier?
6. Add a method
askForCoins(Coin coinType)
to the Purse class that asks the user how many coins of that type to add to the purse and that updates the coin count.
7. Implement a class Student. For the purpose of this exercise, a student has a name and a total quiz score. Supply an appropriate constructor and methods
  • getName()
  • addQuiz(int score)
  • getTotalScore(), and
  • getAverageScore()

To compute the latter, you also need to store the number of quizzes that the student took.

8. Implement a class Product. A product has a name and a price, for example 
new Product("Toaster", 29.95)
Supply methods printProduct(), getPrice(), and setPrice(). Write in a program that makes two products, prints them, reduces their prices by $5.00, and then prints them again.
9. Implement a class Circle that has methods getArea() and getCircumference(). In the constructor, supply the radius of the circle.
10. Implement a class BeerCan with methods getSurfaceArea() and getVolume(). In the constructor, supply the height and radius of the can.

Last updated: June 25, 2000 by Adrian German for A201