What’s wrong with this code? function start() { move(); go(); go(); } function go() { move(); move(); } function go() { move(); move(); }

The go function has been defined twice

The go function is called twice

The go function has a syntax error

go is not a command that Karel understands

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

Why does a programmer indent their code?

Helps show the structure of the code.

Easier for other people to understand.

A key part of good programming style!

Karel starts at Street 1, Avenue 1, facing East in a 5x5 world. What will happen after this code runs? Assume this is a SuperKarel program. move(); move(); turnRight(); move();

Karel ends on street 1, avenue 3

Karel ends on street 2, avenue 3

This code won’t run because of a syntax error

What is top down design?

Top down design is a way of designing your program by starting with the biggest problem and breaking it down into smaller and smaller pieces that are easier to solve.

Top down design is a way that you can create designs on a computer to put on a web page

Top down design is a way of designing your programs starting with the individual commands first

Top down design is a way to use loops and if statements to decompose the problem

How can we improve the following program? function start() { move(); move(); move(); move(); move(); move(); move(); move(); move(); }

Use a for loop to repeat the move command

Break down this program into more functions

Use a while loop to repeat the move command

Fix the indentation of this program

In the following code below from the Cleanup Karel example, what is the purpose of If Statement #2? // This program has Karel walk down the // row and clean up all of the tennis balls // on the way. function start() { while (frontIsClear()) { // If statement #1 if (ballsPresent()) { takeBall(); } move(); } // If statement #2 if (ballsPresent()) { takeBall(); } }

To pick up the ball that is in the last spot, if there is one

To take the ball from all of the positions that have a ball on them

In the following code, what would be a good Postcondition to write? /* Precondition: Karel is on a spot with a tennis ball facing East Postcondition: ... / function getOnTop() { turnLeft(); move(); turnRight(); }

Karel ends one spot above a tennis ball facing East.

Karel is on a spot with a tennis ball facing north

Karel is on the same position but on top of a ball.

What is the purpose of using a for loop in code?

To repeat something a fixed number of times

To do something if a condition is true

To do something while a condition is true

Karel starts at Street 1, Avenue 1, facing East in a 5x5 world. What will happen after this code runs? move(); putball(); move(); move(); move(); move(); move();

This code won’t run because of a syntax error

Karel will end on Street 1, Avenue 2

Karel will end on Street 1, Avenue 7

You want to read input from the user to know how many apples they would like to buy. Which statement should you use to read in a number from the user?

var applesToBuy = readInt("How many apples would you like? ");

var applesToBuy = readLine("How many apples would you like? ");

var applesToBuy = println("How many apples would you like? ");

var applesToBuy = nextInt("How many apples would you like? ");

In a graphics canvas,, what are the coordinates of the center of the canvas?

getWidth() / 2, getHeight() / 2

getHeight() - getWidth(), getWidth() - getHeight()

getHeight() / 2, getWidth() / 2

In the following code: var size = 20; var x = 100; var y = 200; var ball = new Circle(size); ball.setPosition(x, y); What is the meaning of the x variable?

The x coordinate of the center of the circle

The x coordinate of the left edge of the circle

The following program should draw a circle on the screen 1 function start(){ 2 var circle = new Circle(40); 3 circle.setPosition(getWidth() / 2, getHeight() / 2); 4 circle.setColor( Color.blue ); 5 } But when we run this code, we don’t see the circle. What is missing from our start function?

We create the circle and position it correctly on the screen, but we never add it to the screen. We need to add the line add(circle); after line 4

We never set the circle’s radius. We need to add the line circle.setRadius(40); After line 4

We are setting the position of the ball to be off the canvas. We need to change line 3 to be circle.setPosition(0, 0);

We are creating the circle incorrectly. We need to specify the width and height. We need to change line 2 to be var circle = new Circle(40, 40);

Karel Programming Commands and Functions

Authored by Savage Eto

Chemistry

12th Grade

NGSS covered

Used 2+ times

Karel Programming Commands and Functions

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32 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following commands is a valid Karel command?

Move

Move;

move( ) ;

move ( )

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is 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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

function turnRight( ) {

turnLeft();

}

function turnRight( ) {

turnRight();

}

function turnRight {

turnLeft();

}

turnRight function( ) {

turnLeft();

}

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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 time

Called 3 times, defined 1 time

Called 3 times, defined 3 time

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Karel Programming Commands and Functions

Which of the following commands is a valid Karel command?

Why is the following command an invalid Karel command?
turnleft ( ) ;

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

Why do we use functions in Karel programs?

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();

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();
}

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(); }

What’s wrong with this code?
function start() {
move();
go();
go();
}
function go() {
move();
move();
}
function go() {
move();
move();
}

How many total times will Karel move in this program?
function start() {
move();
for (var i = 0; i < 5; i++) {
move();
putBall();
}
}

What is wrong with this for loop?
for (var i = 0, i < 10, i + 1) {
move();
}
I. The for loop uses commas instead of semicolons
II. It should say i++ instead of i + 1

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Discover more resources for Chemistry

Karel Programming Commands and Functions

Which of the following commands is a valid Karel command?

Why is the following command an invalid Karel command?turnleft ( ) ;

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

Why do we use functions in Karel programs?

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();

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(); }

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(); }

What’s wrong with this code?function start() { move(); go(); go(); } function go() { move(); move(); } function go() { move(); move(); }

How many total times will Karel move in this program?function start() { move(); for (var i = 0; i < 5; i++) { move(); putBall(); } }

What is wrong with this for loop?for (var i = 0, i < 10, i + 1) { move(); }I. The for loop uses commas instead of semicolonsII. It should say i++ instead of i + 1

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Discover more resources for Chemistry

Why is the following command an invalid Karel command?
turnleft ( ) ;

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();

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();
}

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(); }

What’s wrong with this code?
function start() {
move();
go();
go();
}
function go() {
move();
move();
}
function go() {
move();
move();
}

How many total times will Karel move in this program?
function start() {
move();
for (var i = 0; i < 5; i++) {
move();
putBall();
}
}

What is wrong with this for loop?
for (var i = 0, i < 10, i + 1) {
move();
}
I. The for loop uses commas instead of semicolons
II. It should say i++ instead of i + 1