Second Summer 2002

You have to define a class Robot that describes a robot very similar to the one you worked with in the first lab. To clarify how easy this problem is we need to say that metaphorically your robot is:

• a Penguin
• a Tigger
• a BankAccount
• a Rectangle
• a ConsoleReader
• a String

• turnLeft (90 degrees)
• moveForward (one step)

Two methods:

• getX(), and
• getY()

The location of the robot is a pair ( x , y ) of integers, that describes the position of the robot.

When you create a Robot one need specify:

• the location (x, y)
• a name for the robot
• the direction the robot is facing

• report the direction() it's facing (N, S, W, E)
• produce a complete report() (x, y, name, direction)

class Walk {
    public static void main(String[] args) {

	Robot a = new Robot("Alice", 2, 3, "North"); 
	a.report(); 

	Robot q = new Robot("Queen", -4, -1, "West"); 
	q.report(); 

	a.turnLeft(); 
	a.report(); 

	a.moveForward(); 
	a.report(); 

	a.turnLeft(); 
	a.report(); 

	a.moveForward();
	a.report(); 

	a.moveForward();
	a.report();  

	a.moveForward();
	a.report(); 

	q.moveForward();
 	q.report(); 

	q.turnLeft(); 
 	q.report(); 
    } 
}

frilled.cs.indiana.edu%java Walk
Robot Alice located at (2, 3) facing North
Robot Queen located at (-4, -1) facing West
Robot Alice now turns left.
Robot Alice located at (2, 3) facing West
Robot Alice now moves forward.
Robot Alice located at (1, 3) facing West
Robot Alice now turns left.
Robot Alice located at (1, 3) facing South
Robot Alice now moves forward.
Robot Alice located at (1, 4) facing South
Robot Alice now moves forward.
Robot Alice located at (1, 5) facing South
Robot Alice now moves forward.
Robot Alice located at (1, 6) facing South
Robot Queen now moves forward.
Robot Queen located at (-5, -1) facing West
Robot Queen now turns left.
Robot Queen located at (-5, -1) facing South
frilled.cs.indiana.edu%

Please take a moment to think about the referential we use in this problem which is the same one that we use in computer graphics (see lecture notes three on Jun 19) which is also the reason for which Tigger is (let's say) upside down on the main page of this web site. As always, please let us know if you have any questions, of course.

Grading scale.

• 10 points for providing the constructor(s) needed
• 25 points for your Robot being able to store the location, name, and direction facing
• 15 points for reporting the location (x, y), the direction, and the name individually
• 5 more points for putting all of that together in a method report(), and
• 40 points for your Robot's ability to turnLeft() and moveForward() as shown

That's a total of 95 (which is the highest A). For more come up with something worth it.

Let us know if you have any questions or if you need any help.