Programming with Karel Final

Which of the following commands is a valid Karel command?

• takeBall

• PutBall;

• takeBall();

• takeBall()

What makes the following command an invalid Karel command?

turnright();

• It should end in a colon rather than a semicolon

• The r should be a capital R

• It should start with a capital T

• This command is correct

Which of the following is the correct way to define a moveTwice function in Karel?

• function moveTwice() {

  turnLeft();

  turnLeft();

  turnLeft();

  }

• function moveTwice() {

  move();

  move();

  }

• function turnRight() {

  turnLeft();

  turnLeft();

  turnLeft();

  }

• moveTwice function() {

  move();

  move();

  }

Why do we use functions in Karel programs?

• Break down our program into more codes to write

• Avoid repeating code

• Make our program longer and more complicated

• All of the above

In this code, how many times is the jump function called and how many times is it defined?

function start() {

move();

jump();

move();

move();

jump();

jump();

move();

}

function jump() {

turnLeft();

move();

turnLeft();

turnLeft();

turnLeft();

move();

turnLeft();

turnLeft();

turnLeft();

move();

turnLeft();

}

• Called 2 times, defined 1 time

• Called 1 time, defined 3 times

• Called 4 times, defined 1 time

• Called 3 times, defined 1 times

What’s wrong with this code?

function start() {

move();

slide();

slide();

}

function slide() {

move();

move();

move();

}

function slide() {

move();

move();

move();

}

• The slide function is defined twice

• The slide function has a syntax error

• The slide function has been defined twice

• slide is not a command that Karel understands

How many total times will Karel put a ball in this program?

function start() {

move();

for (var i = 0; i < 5; i++) {

move();

putBall();

}

}

• 1

• 5

• 2

• 7

What is wrong with this for loop?

for (var i = 0, i < 5, i ++) {

move();

}

I. The for loop uses commas instead of semicolons

II. It should say i++ instead of i + 1

• I

• II

• I and II

• The for loop is correct

What is the proper format for a single line comment in Karel?

• This is a comment

• // This is a comment

• /* This is a comment

What does the mystery function do?

function mystery() {

while (noBallsPresent()) {

move();

}

}

• Karel moves until it is on a ball

• Karel moves once if there is no ball present

• Karel moves until it puts down a ball

• Karel checks if there is no ball on the current spot and then moves once