Karel Unit Quiz

Which of the following commands is a valid Karel command?

• turnright();

• turnRight;

• turnRight():

• turnright();

What makes the following command an invalid Karel command: takeball();

• it should start with a capital T

• the b should be capitalized

• it should end in a colon instead of a semicolon

• none of these; this command is correct!

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

• function turnRight() {

  turnRight():

  turnRight():

  turnRight():

  }

• function turnLeft() {

  turnLeft():

  turnLeft():

  turnLeft():

  }

• function turnLeft() {

  turn Right ():

  turn Right ():

  turn Right ():

  }

• function turnRight() {

  turnLeft();

  turnLeft();

  turnLeft();

  }

Why do we use functions in Karel programs?

• to break down our program into smaller parts

• to avoid repetition of code

• to make our program more readable

• all of these

If Karel starts on Street 1 and Avenue 1, facing East, where will Karel be, and what direction will Karel be facing after running the following code in a 10 x 10 world?

move();

turnLeft();

putBall();

turnLeft();

turnLeft();

turnLeft();

move();

turnLeft();

• Street 1, Avenue 3, Facing South

• Street 1, Avenue 3, Facing North

• Street 3, Avenue 1, Facing North

• Street 3, Avenue 1, Facing South

Karel starts at Street 1 & Avenue 1 facing East. After calling the goUp function twice, where will Karel be and what direction will he be facing in a 10 x 10 world?

function goUp() {

move();

turnLeft();

move();

turnRight();

}

• Street 1, Avenue 2, Facing North

• Street 1, Avenue 3, Facing South

• Street 3, Avenue 3, Facing East

• Street 1, Avenue 3, Facing West

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

function start();

move();

climb();

move();

move();

turnLeft();

climb();

climb();

}

function climb() {

turnLeft();

move();

turnLeft();

turnLeft();

move();

turnLeft();

}

• called once, defined once

• called once, defined three times

• called once, defined twice

• called three times, defined once

What's wrong with this code?

function start() {

move();

go();

go();

}

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();

}

}

• 6

• 5

• 4

• 3

What is wrong with this for loop?

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

move();

}

• this for loop should not have an indented section before move();

• the for loop should not have two +'s after the i

• the for loop is correct!

• the for loop uses commas instead of semicolons