Java Script Control Structures

Java Control Vocab

100

A loop that repeats code a fixed number of times

For Loop

200

These are used to make comparisons between values

Comparison Operators

300

The repetition of instructions a specified number of times, or until a condition is met

Iteration

400

Code that you put inside an if statement or while loop

Condition 

500

Repeating code as long as something is true

While Loop 

Looping

100

How many times will the following program print "hello"?

var i = 0;

while (i < 10){

println("hello");}

This code will loop infinitely

200

We want to print the phrase "CodeHS is the best" exactly 25 times. What kind of control structure should we use?

For Loop

300

We want to simulate constantly flipping a coin until we get 3 heads in a row. What kind of loop should we use?

While Loop

400

Which of the following returns a random number between 1 and 99?

A. randomInt (1,99)

B. randInt(1,99)

C. Randomizer.nextInt(1,99)

D. Randomizer.int (1,99)

Randomizer.nextInt (1,99)

500

Consider the following program. Which of the following is NOT a possible output when this runs?

function start(){

var mysteryNum= 10 * Randomizer.nextInt(2,10);

println(mysteryNum);

}

A. 50

B. 30

C. 10

D. 90

10

Boolean

100

These can be used to make logical associations between boolean values

Logical Operators

200

Determine what the following expression would evaluate to.

(9 =/ 7 AND 17 < 4 ) OR 65 < 9

False

300

Which of the following Boolean expressions is equivalent to the expression?

( a AND b ) OR (a AND c)

A. (a AND b) OR c

B. (a AND b) AND ( a AND c)

C. (b AND c) OR a

D. a AND (b OR C)

a AND (b OR c)

400

IF ((NOT rainy) AND (NOT tooCold))

{DISPLAY("It's a good beach day")}

Which of the following are equivalent to the above code block?

A. IF ((NOT rainy) OR (NOT tooCold))
{DISPLAY ("It's a good beach day")}

B. IF ((NOT rainy) AND tooCold) 

{DISPLAY ("It's a good beach day")}

C. IF (NOT (rainy OR tooCold))

{DISPLAY (It's a good beach day")}

D. IF (rainy AND tooCold)

{DISPLAY ("It's a good beach day")}

C. IF (NOT (rainy OR tooCold)

{

DISPLAY (It's a good beach day")

}

500

What is the value of the boolean variable canVote at the end of this program?

var age = 17;

var isCitizen = true;

var canVote = age >= 18 && isCitizen;

FALSE

What will print?

100

What is the last thing printed by the following program?

var start = 30;

var stop = 10;

for ( var i = start; i >= stop; i -=5){

if (i % 2 ==0){

println(i*2);

} else{

println(i);

}

}

20

200

What will the following program print when run?

for (var j = 0; j < 2; j++) {

for (var i = 6; i > 4; i --){

println (i);

}

}

6

5

6

5

300

What is printed by the following program?

var isRaining = false;

var isCloudy = false;

var isSunny = !isRaining && !isCloudy;

var isSummer = false;

var isWarm = isSunny || isSummer;

println("Is it warm:" + isWarm);

Is it warm: true

400

What is printed by the following program?

var numApples= 10;

var numOranges= 5;

if(numApples < 20 || numOranges == numApples){

println("Hello, we are open!");

}else{

println("Sorry, we are closed!");

} 

println("Sincerely, the grocery store");

Hello, we are open!

Sincerely, the grocery store

500

What will the following program print when run?

var above16= true;

var hasPermit= true;

var passedTest= false;

if(above16 && hasPermit && passedTest){

println("Issue Driver's License");

}else{

if(above16 || hasPermit || passedTest){

print ln("Almost eligible for Driver's License");

}else{

println("No requirements met.");

}

}

Almost eligible for Driver's License

Program Outputs

100

What will be the output of this program?

var number = 5;

var greater_than_zero = number > 0;

if(greater_than_zero){

println(number);

}

5

200

What will be the output of this program?

var number = 5;

var greater_than_zero = number > 0;

if(greater_than_zero){

if(number>5){

println(number);

}

Nothing will print

300

What is the output of the following program?

var result = 0;

var max = 5;

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

result+= i;

}

println(result);

10

400

What will be the output when the following code runs?

function start(){

var loggedIn = false;

println("User logged in?:" + !loggedIn);

}

User logged in?: true

500

What is the output of the following program?

var numberOne = 5;

var numberTwo = 10;

 if(numberOne == 5){

println(1);

}

if (numberOne > 5){

println(2);

}

if(numberTwo < 5) {

println(3);

}

if (numberOne < numberTwo) {

println(4);

} 

if (numberOne ! = numberTwo){

println(5);

}

1

4

5