Question

ITP 100 Programming Assignment 1

This program uses the Little-Crab-3 scenario complete the following steps. Start with a fresh un-edited copy of Little-Crab-3. When finished paste each of your class source code files into word and submit through Canvas.

1.   Change the code to make the crabs turn left when the l (lowercase L) key is pressed. Make the crabs turn right when the r key is pressed.

public void act()

   {

       if(Greenfoot.isKeyDown("l"))

       {

           turn(-15);

       }

       if (Greenfoot.isKeyDown("r"))

       {

           turn(15);

       }

           

   }

2.   Make changes to the code so that the worms will randomly move between 1 and 10 each time act is pressed

public void act()

{

   if( Greenfoot.getRandomNumber(1));

   {

      move(4);

   }

   if( Greenfoot.getRandomNumber(10));

}

Move(4);

}

3.     Make changes to the code so that the worm will randomly eat lobsters 15% of the time (you may need to check if you are touching a Lobster first)

public void act()

{

   if ( isAtEdge())

   {

       turn(17);

   }

   if( Greenfoot.getRandomNumber(100)<15 )

   {

       turn(4);

   }

   move(5);

}

4.   Create a method named mover that has an integer parameter named distance, and no return type. This method causes the crab to move the value of the distance parameter.

public void act()

{ randomMove();

}

void randomMove()

{

move(Greenfoot.getRandomNumber(15);

}

5. Add code that will cause the crab to turn 17 if the q button is pressed

public void act()

   {

       turnCrab();

   }

   void turnCrab()

   {

       if(Greenfoot.isKeyDown("q"))

       {

           turn(17);

       }

   }

6.   Add code that will cause the crab to turn -17 if they w button is pressed

public void act()

   {

       turnCrab();

   }

   void turnCrab()

   {

       if(Greenfoot.isKeyDown("w"))

       {

           turn(-17);

       }

   }

I am working on this assignment - Is there anyone who can help me check my answer - I think I am making some mistakes - correct me with explanation please

Answer 1

Answering the first Question i.e. 1:

Modified Code:

public void act()

   {

       if(Greenfoot.isKeyDown("l"))

       {

           turn(-15);

       }

       if (Greenfoot.isKeyDown("r"))

       {

           turn(15);

       }

           

   }

Reason:

1. This code is correct.

2. Here, when the l (lowercase L) key is pressed, a left turn is made using turn(-15).

3. Here, when the r  key is pressed, a right turn is made using turn(15).

4. To judge the key pressing action, code use Greenfoot.isKeyDown() function