greenfoot

Question 1

what does round brackets mean?

Answer 1

they are used in mathematical expressions, and to surround the parameter lists for method calls

Question 2

what does curly brackets mean?

Answer 2

these are used to surround blocks of code, such as methods or the contents of classes.

Question 3

what does square brackets mean?

Answer 3

they are used for arrays.

Question 4

what does compile mean?

Answer 4

compile combines the different classes and subclasses onto the world, we must compile the classes before we run the program otherwise it wouldn’t work, if we don’t compile the classes, they are unable to go on the world

Question 5

what does move() mean?

Answer 5

allows the classes/objects to move and the number inside the brackets dictates how far it moves each click

Question 6

what does SetRotation() mean

Answer 6

allows the classes/objects to turn and the number inside the bracket dictates how far it turns

Question 7

what does if() mean?

Answer 7

this works the same way an if statement does in python for example if the down key is pressed it will move down (if that’s how you have programmed it)

Question 8

whats does Greenfoot.isKeyDown(“left”) mean?

Answer 8

if the left arrow key is pressed the classes/ object will turn left

Question 9

how would you make the classes turn right and move?

Answer 9

if (Greenfoot.isKeyDown(“right”))
{
setRotation(0);
move(1);
}

Question 10

how would you make it so that if your main character touches a specific actor, the specific actor will disappear?

Answer 10

if(isTouching(cherry.class))
{
removeTouching(cherry.class);
}

Question 11

how do you add a counter so that when the cherry disappears a point is added to this previous piece of code?

Answer 11

if(isTouching(cherry.class))
{
removeTouching(cherry.class);
Counter counter = (Counter)getWorld().getObjects(Counter.class).get(0);
counter.add(1);
}

Question 12

how would the code look if you wanted to change it so that when the plum disappears a point is deducted

Answer 12

if(isTouching(plum.class))
{
removeTouching(plum.class);
Counter counter = (Counter)getWorld().getObjects(Counter.class).get(0);
counter.add(-1);
}

Question 13

how do you make your actor turn at random

Answer 13

move(1);
if (Greenfoot.getRandomNumber(10)<1)
{
turn(Greenfoot.getRandomNumber(90)-45);
}

Question 14

how would you play a sound when a cherry is removed

Answer 14

if(isTouching(cherry.class))
{
removeTouching(cherry.class);
Greenfoot.playSound(“sound2.mp3”);
}