Lab Assignment 1

Due date : August 27, 12 PM EST

Total Marks : 58

Important Note :

• The deadline will NOT be extended.
• Programs submitted after the due date and time will not be accepted.
• You must work collaboratively with your group-mate.
• You must submit the peer evaluation form along with your program.

Today’s Exercise

Topics	Lab Exercises	Points
Printing strings	Prelab exercises Poem	10 10
Identifiers	Program names	10 + 4x7

Prelab Exercises

Your task is to write a Java program that will print out the following message (including the row of equal marks):

Computer Science, Yes!!!!

=========================

An outline of the program is below. Complete it as follows:

• In the documentation at the top, fill in the name of the file the program would be saved in and a brief description of what

            the program does.

• Add the code for the main method to do the printing.

// *******************************************************************

// File Name:

//

// Purpose:

// *******************************************************************

public class CSYes

{

// -------------------------------------------------

// The following main method prints an exciting

// message about computer science

// -------------------------------------------------

}

Poem

Write a Java program that prints the message, "Roses are red". Your program will be a class definition containing a main

Method. Remember the following:

• The name of the class must match the name of the file (but without the .java extension).
• The main method must be inside the class definition (between the first {and the last }).
• The statement that prints the message must be inside main.

Compile and run your program. When it works correctly, modify it so that it prints the entire poem:

Roses are red

Violets are blue

Sugar is sweet

And so are you!

Identifiers and Program Names

http://java.sun.com/docs/books/tutorial/java/nutsandbolts/_keywords.html

The various words that are used in a program are called identifiers. There are three types of identifiers:

• words that we  make up (such as program name, variable name)
• words that another programmer made (such as String, System, println)
• words that are reserved for special purposes in the language (class, public, static, void)

File Simple.java contains a simple Java program that prints a message. The identifier that represents the name of this program

is Simple, but we could have chosen a different identifier subject to certain rules and conventions. Remember:

• An identifier may contain any combination of letters, digits, the underscore character, and the dollar sign, but cannot begin with a digit.
• By convention, identifiers that represent class names (which includes program names) begin with a capital letter.
• The program name should always be reasonably descriptive of the program.

Complete the table below. Then save Simple.java to your directory and check your answers by modifying

it to try each—note that you will have to change the file name each time to match the program name or you will always get

an error.

// ********************************************

// Simple.java

//

// Print a simple message about Java.

//

// ********************************************

public class Simple

{

public static void main (String[] args)

{

System.out.println ("Java rocks!!");

}

}

Program Name	Legal identifier?	Why?	Good choice of name?	Why?
simple
SimpleProgram
1Simple
_Simple
*Simple*
$123_45
Simple!