Unit 1 Intro to Progamming with Karel

Which of the following commands is a valid Karel command?

• move

• move;

• move();

• move()

What makes the following command an invalid Karel command?

turnleft();

• It should end in a colon rather than a semicolon

• The l should be a capital L

• It should start with a capital T

• This command is correct

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

• function turnRight() {

  turnLeft();

  turnLeft();

  turnLeft();

  }

• function turnRight() {

  turnRight();

  turnRight();

  turnRight();

  }

• function turnRight {

  turnLeft();

  turnLeft();

  turnLeft();

  }

• turnRight function() {

  turnLeft();

  turnLeft();

  turnLeft();

  }

Why do we use functions in Karel programs?

• Break down our program into smaller parts

• Avoid repeating code

• Make our program more readable

• All of the above

If Karel starts at Street 1 and Avenue 1, facing East, where will Karel be, and what direction will Karel be facing after running the following code? (Assume the world is 10x10 in size)

move();

turnLeft();

putBall();

turnLeft();

turnLeft();

turnLeft();

move();

turnLeft();

• Street 3, Avenue 1, Facing North

• Street 1, Avenue 4, Facing North

• Street 1, Avenue 3, Facing South

• Street 1, Avenue 3, Facing North

Karel starts at Street 1 and Avenue 1, facing East. After calling the stairStep function twice, where will Karel be and what direction will Karel be facing? (assume this is a SuperKarel program and the world is 10x10 in size)

function stairStep() {

move();

turnLeft();

move();

turnRight();

}

• Street 2, Avenue 2, Facing North

• Street 3, Avenue 3, Facing East

• Street 3, Avenue 3, Facing West

• Street 4, Avenue 4, Facing East

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

function start() {

move();

dance();

move();

move();

turnLeft();

dance();

dance();

}

function dance() {

turnLeft();

move();

turnLeft();

turnLeft();

move();

turnLeft();

}

• Called 1 time, defined 1 time

• Called 1 time, defined 3 times

• Called 3 times, defined 1 time

• Called 3 times, defined 3 times

What’s wrong with this code?

function start() {

move();

go();

go();

}

function go() {

move();

move();

}

function go() {

move();

move();

}

• The go function is called twice

• The go function has a syntax error

• The go function has been defined twice

• go is not a command that Karel understands

How many total times will Karel move in this program?

function start() {

move();

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

move();

putBall();

}

}

• 1

• 5

• 6

• 7

What is wrong with this for loop?

for (var i = 0, i < 10, i + 1) {

move();

}

A. The for loop uses commas instead of semicolon

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

• A

• B

• A and B

• The for loop is correct