Syntax
Java Math
Loops
Variables
Conditional Logic and If-else Statements
100
True or False: This is what the main method looks like:
public void main(String args) {
}
False
100
How would you raise 2 to the y power?
Math.pow(2, y)
100
True or False: While loops and Do-While loops operate based on a condition.
True
100
List 3 types of primitive variables.
Any 3 of the following: int, double, char, boolean, float, long, short, byte
100
What are the two values that conditional statements can evaluate to?
True or false.
200
True or false: You do not put semicolons at the end of a loop or conditional statement
True
200
double myDouble = 20.0 % 4.0;
What is the numerical value of myDouble?
myDouble = 5.0
200
What type of loop does this flow chart illustrate?
Do while loop
200
What is the difference between = and ==?
= assigns variables, while == checks a boolean condition.
200
Write a simple if statement that prints only out a number n if it is even.
if (n%2 == 0)
System.out.println (""+n);
300
Which Scanner method returns an integer?
nextInt(), nextDouble()
300
int myInt = 3 / 4;
What is the numerical value of myInt?
myInt = 0
300
How do you write a for loop that iterates 10 times?
for(int i = 0; i < 10; i++) OR
for(int i = 1; i <= 10; i++)
300
True or false: Strings are a type of primitive variable.
False
300
True or false: Statements with an else-if do not have to also have an if at the beginning.
False
400
What does Math.random()*2+30 return?
It returns a random double between 30 and 32.
400
What are the three parts of a for-loop? (Describe them if you don't know the exact name)
Initialization, condition, and change
400
int myInt = 8;
How would you cast myInt into a double?
double myDouble = (double) myInt;
400
Write the syntax for an if...else if... else statement (there does not need to be code inside the statements themselves, and you can make up any conditions you want)
if (//condition) {
//block of code
}
else if (//condition) {
//block of code
}
else {
//block of code
}
500
What is the difference between the Scanner methods String next() and String nextLine()?
next() returns a String with no spaces, while nextLine() returns a String with multiple spaces.
500
How do you come up with a random integer value between 1 and 45?
int myInt = (int) (Math.random()
500
Write a while loop to continuously prompt a user to enter a number if their number is greater than 20. (Use Scanners here!)
Scanner sc = new Scanner(System.in)
int num = sc.nextInt();
while(num > 20) {
System.out.println("Enter a new number!");
num = sc.nextInt();
}
500
What is the difference between declaring and assigning variables?
Assigning variables assigns a value to a variable while declaring a variable does not assign a value.
500
Write the conditional statement for checking if an integer x is divisible by three and negative.
if(x %3 == 0 && x < 0) {
System.out.println("x is divisible by three and negative.");
}