1. CS 240 – Computer Programming I Lab Kalpa Gunaratna – kalpa@knoesis.orgkalpa@knoesis.org http://knoesis.wright.edu/researchers/kalpa/

2. Contact  Contact by e-mail  kalpa@knoesis.org kalpa@knoesis.org  Office hours  376 Joshi  Mondays & Wednesday 3:00 pm – 4:00 pm

3. About me  Kalpa Gunaratna  Sri Lanka  Graduate from University of Colombo, Sri Lanka  Computer Science first year PhD student @ Wright State University and member of Kno.e.sis Center of Wright State University.  More information if you are interested in knowing my background  http://knoesis.wright.edu/researchers/kalpa/ http://knoesis.wright.edu/researchers/kalpa/

4. Some rules and guidelines to remember  Lab consists of two parts  Part I – in lab which is due on the second lab session of the week.  Part II – post lab which is due before next week’s lab session starts.  You cannot turn in assignments later than this deadlines. 0 marks otherwise.  Make sure you follow these deadlines and normally ignore WebCt deadlines.  Because WebCt deadline is set for all set of classes  Upload the zipped Net Beans project to WebCt.

5.  You will have 4 projects. Each project will have a deadline posted in WebCt.  Projects are accepted only until 3 days past deadline and each day accounts for 10% off from your total eligible score.  I may sometimes make minor changes to assignments in the lab and make sure you make a note of them!  If you use a lab computer please save your net beans project into pen drive or e-mail.

6. Today’s lab!  Demo on how to create a project in Net Beans and saving.

7. Basic variable initialization & creation  Initialize  ;  eg: int x;  Assign a value  = ;  eg: x = 5;  Some data types  int, short, long, double, float, string, char, boolean,etc.

8. int integerNumber = 0; double doubleNumber = 0.0; Scanner keyboard = new Scanner(System.in); System.out.println("Hello World!"); System.out.println("This is my first JAVA program"); System.out.print("Enter any integer (1 or 2 or... up to 9999): "); integerNumber = keyboard.nextInt(); System.out.println("You entered the integer " + integerNumber); System.out.print("Enter any floating point number \n" + "(any # with a decimal point): "); doubleNumber = keyboard.nextDouble(); System.out.println("You entered the floating point number " + doubleNumber); String outputMsg = "The sum of the integer and the double is " + (integerNumber + doubleNumber); JOptionPane.showMessageDialog(null, outputMsg,"Lab1 Output", JOptionPane.INFORMATION_MESSAGE); System.out.println("bye"); Variable creation and assignment

9. Get input from key board  Scanner keyboard = new Scanner(System.in);  keyboard is the given name to the variable here. You can use any name you like. Object typenameCreate new object and assign to name

10. Hints on how to build a String  Example String outputMsg = "The sum of the integer and the double is " + (integerNumber + doubleNumber);  Can concatenate Strings with “+” operator.

11. Print with restricted decimal places  How to control decimal places in printing  System.out.printf(“%.2f \n", 1234.123);  You can also use DecimalFormat class in java.