COMP 110 Summer 2012

Description

Lab 2 will introduce you to Java applets, string manipulation, and type casting. You have been given a skeleton program StringFun.java that can be found on the course webpage. Copy the program into Eclipse (You will need to create a new Java Project called lab2 and a new Java Class called StringFun), and compile and run the program. (Don't forget to add the header!)

Part 1

Characters are stored as numbers in a computer. This java applet converts the input integer to the unique Unicode character stored as that number. Appendix 7 has a subset of the Unicode character set. Note: the input integer was type cast as a character.
(char)inputInt

• Comment out the first JOption line and uncomment the second JOption line. Recompile and run the program.
• The second display box should now say Rocks!
• Add your favorite band's name to the dialog box by type casting Unicode characters. Start the name of your band after the "". Use Appendix 7 for a reference. (choose a band that has more that 5 characters in the name.)

Part 2

For this part of the lab you will modify the code StringFun.java to prompt the user for a string (of characters) and output information about the string as well as manipulate the input string. You will be referencing pages 75-80 of your textbook.

• Declare a variable of Type String to be your input string with identifier inputString.
• Prompt the user to input a string.
  inputString = JOptionPane.showInputDialog("Please Enter a string:");
  This line of code will prompt the user and store the input string in inputString
• Manipulate the string stored in inputString — reference pages 75-80. For each step, print out a new dialog box using
  JOptionPane.showMessageDialog(null, your output goes here);
• Output the length of inputString
• Convert inputString to all uppercase letters
• Print out the characters at positions 0 and 5 (assume the user input a string with more than 6 characters)
• Display the substring starting at position 0 and ending at position 5
• Display the inputString without the first word. (Hint: find the index of the first space in the string. Then display the substring starting at the next index past the first space)

Part 3

Modular Arithmetic (Solve these problems, Remember you are calculating the remainder)

• 21 % 5
• 47 % 12
• 72 % 60