CPS 2231 Computer Organization and Programming

1. CPS 2231 Computer Organization and Programming Instructor: Tian (Tina) Tian

2. About me • Email: ttian@kean.edu • Office: HH-217 • Office Hour: Monday, Wednesday 2:30 – 4:30 PM • Tuesday, Thursday 3:15 – 5:00 PM • Website: TBA

3. About the Course • Mondays, Wednesdays 12:30 PM – 2:25 PM • Textbook (Chapter 6 - ) • Grading: Midterm Exam (7th Week) 30% • Final Exam 30% • Lab Assignments and Homework 40% • Be close to the computers and try out the example programs! • You can work as a team but don’t copy codes.

4. About Eclipse • Free Download: http://www.eclipse.org/downloads/ • You may need Java JDK or Java JRE. • No installation is needed. • You can save it under “Program Files” and create a desktop shortcut.

5. Review of CPS 1231 • Variable and data type • If/ if.. else statement • Switch statement • While/do-while loop • For loop • Methods

6. Variable • int x; • int x = 1; • final double PI = 3.14; • Use lowercase for variables and methods. E.g., numberOfStudents. • Capitalize the first letter of each word in a class name. E.g., ComputeArea. • Capitalize every letter in a constant. E.g., MAX_VALUE.

7. Data Type • Numeric data types: byte, short, int, long, float, double • char letter = ‘A’; • boolean flag = true; • String message = “Welcome to CPS 2231”; • Converting string to numbers: • String s = “123”; • int value = Integer.parseInt(s);

8. Input and Output • import java.util.Scanner; • Scanner scanner = new Scanner(System.in); • int value = scanner.nextInt(); • String s = scanner.next(); • System.out.println(“You just entered “ + s);

9. Now let’s try it in Eclipse.

10. Selection Statement • if (score >= 90) • grade = “A”; • else if(score >= 80) • grade = “ B”; • else if (score >= 70) • grade = “ C”; • else if (score >= 60) • grade = “ D”; • else • grade = “ F”;

11. Selection Statement • switch (option) { • case 0: System.out.println(“taxes for single filers”); • break; • case 1: System.out.println(“taxes for married file jointly”); • break; • case 2: System.out.println(“taxes for married file seperately”); • break; • default: System.out.println(“Invalid status”); • }

12. Loops • int count = 0; • while (count < 100) { • System.out.println(“Welcome to Java!”); • count++; • } • for (inti = 0; i< 100; i++) { • System.out.println(“Welcome to Java!”); • }

13. Methods • public static String grading (double score) { • String grade = “”; • if (score >= 90) • grade = “A”; • else if(score >= 80) • grade = “B”; • else if (score >= 70) • grade = “C”; • else if (score >= 60) • grade = “D”; • else • grade = “F”; • return grade; • } • String grade = grading(83);

14. Exercise 1: Number Guessing Game • Write a program that generate an integer between 0 and 10 and prompts the user to enter (guess) this number. The program then reports true if the answer is correct, false otherwise.

15. Exercise 2: Number Guessing Game • Revise Exercise 1, so that the user can keep entering (guessing) the number until he/she is right.

16. Exercise 3: Finding the Highest Score • Write a program that prompts the user to enter the number of students and each student’s name and score, and finally displays the student with the highest score.

17. Exercise 4: Conversions between Celsius and Fahrenheit • Write a class that contains the following two methods: • public static double celsiusToFahrenheit (double celsius) • public static double fahrenheitToCelcius(double fahrenheit) • The following formula for the conversion is: • fahrenheit = (9.0/5)*celsius + 32

18. Write a test program that invokes these methods to display the following tables: • Celsius Fahrenheit Fahrenheit Celsius • 40 105.0120 48.89 • 39 102.2110 43.33 • … … • 32 89.640 5.44 • 31 87.830 -1.11

19. Exercise 5: Display an Integer Reversed • Write the following method to display an integer in reverse order: • public static void reverse (int number) • For example, reverse(3456) displays 6543.