Booleans
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
We want to simulate flipping a coin 3 times. What kind of loop should we use?
For Loop
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
What will be the output of this program?
var number = 5;
var greater_than_zero = number > 0;
if (greater_than_zero){
println(number);
}
5
How many possible values can Randomizer.nextBoolean() return?
2
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 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
What is the term for the value that signals the end of user input?
Sentinel
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
Write the code to get a random number between 1 and 99
Randomizer.nextInt(1, 99)
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
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
How many times will the following program print "hello"?
var i = 0;
while(i < 10){
println("hello");
}
This code will loop infinitely
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
Consider the following program. What is the range of possible outputs when this runs?
function start(){
var mysteryNum = 5 * Randomizer.nextInt(2,10);
println(mysteryNum);
}
5 - 50
What will be the output when the following code runs?
function start(){
var loggedIn = false;
println("User logged in?: " + !loggedIn);
}
User logged in?: true
In the following code, what will be the last number to print to the screen before the program finishes?
for (var i = 0; i < 100; i++) {
if (i % 2 == 0) {
println(i);
} else {
println(2 * i);
}
}
198
The following code continually asks the user for a password until they guess the correct password, then ends. But there is one problem.
var SECRET_PASSWORD = "karel";
function start() {
while (true) {
var password = readLine("Enter your password: ");
if (password == SECRET_PASSWORD) {
println("You got it!");
}
println("Incorrect password, please try again.");
}
}
Add a break; statement after line 7 so that the program doesn’t loop infinitely
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) {
println("Almost eligible for Driver's License");
} else {
println("No requirements met.");
}
}
Almost eligible for Driver’s License
Write the code to make a circle move up every time a key is pressed
var circle = new Circle(30);
circle.setPosition(getWidth() / 2, getHeight() / 2);
add(circle);
var MOVE_AMOUNT = 10;
function moveUp() {
circle.move(0, -MOVE_AMOUNT);
}
keyDownMethod(moveUp);
Write a program that gets three variables from the user: their study hours per week, their completed assignments per month, and their participation score out of 10, in that order.
We need to figure out if the student is an outstanding student. They are considered outstanding if they study at least 30 hours per week, OR they study at least 20 hours per week, complete at least 10 assignments per month, and have a participation score of at least 8.
var studyHours = readInt("Enter your study hours per week: ");
var assignmentsCompleted = readInt("Enter your completed assignments per month: ");
var participationScore = readInt("Enter your participation score out of 10: ");
// Check if the student is outstanding
if (studyHours >= 30 || (studyHours >= 20 && assignmentsCompleted >= 10 && participationScore >= 8)) {
println("You are an outstanding student!");
} else {
println("Keep working to improve.");
}
Write a program that prints the numbers from 1 to 100. But for multiples of 3, print “Fizz” instead of the number, and for the multiples of 5, print “Buzz”. For numbers that are multiples of both 3 and 5, print “FizzBuzz”. If a number is not a multiple of either, print the number itself.
for (var i = 1; i <= 100; i++) {
if (i % 3 == 0 && i % 5 == 0) {
println("FizzBuzz");
} else if (i % 3 == 0) {
println("Fizz");
} else if (i % 5 == 0) {
println("Buzz");
} else {
println(i);
}
}
Write a program that uses a loop and a half to simulate flipping a coin, You should keep flipping until they get heads 3 times in a row and then break out of the loop. Print out the result of each flip.
// Function to simulate flipping a coin
function flipCoin() {
return Randomizer.nextBoolean() ? "Heads" : "Tails";
}
// Variable to keep track of consecutive heads count
var consecutiveHeads = 0;
while (true) { // Loop and a half (infinite loop with break condition)
var result = flipCoin();
println(result);
if (result === "Heads") {
consecutiveHeads++;
} else {
consecutiveHeads = 0; // Reset if it's not heads
}
if (consecutiveHeads === 3) {
break; // Exit loop when heads has appeared 3 times in a row
}
}
What will the following program print when run?
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
write the code to make a square change colors every time spacebar is pressed
var square = new Rectangle(50, 50);
square.setPosition(getWidth() / 2 - 25, getHeight() / 2 - 25);
add(square);
keyDownMethod(function(e) {
if (e.keyCode === Keyboard.SPACE) {
square.setColor(Randomizer.nextColor());
}
});