Unit 1a Review

Casting

100

What is it called when you change one data type into another between int and double?

Casting

200

What is the value of (int)5.9?

5

300

If int x = 3; double y = 2.0; what is the result of x / y?

1.5

400

What is the result of (double)(7/2)?

3.0

500

What is the output of the following code?
int a = 5;
int b = 2;
double c = (double) a / b;
System.out.println(c);

2.5

Compound Operators

100

What does ++ do the value of a variable?

Adds +1

200

What is the result if int x = 5; x += 3;

8

300

Rewrite count = count - 1; using a compound operator.

count -=1

400

What is the final value of z given the following code?
int z = 6;
z += 4;
z *= 2;
z -= 5;

15

500

What is the final value of x if
int x = 10;
x *= 2;
x /= 5;
x--;

3

Data Types

100

What is the data type of 0?

int

200

What data type would best store a person’s GPA?

double

300

This data type is used to store true or false values.

boolean

400

What data type is the output of:
System.out.println(3 + 4.0);?

double

500

What is the data type of the output of the following code:
String s1 = "AP";
String s2 = "CSA";
String s3 = s1 + 1 + 2 + s2;
System.out.println(s3);

String

PEMDAS

100

In Java, this operation happens first in the order of operations.

Parentheses

200

What is the value of 2 + 3 * 4?

14

300

What is the value of 2 + 12 / 3 * 2?

10

400

What is the value of 7 / 2 * 2?

6

500

What is the output of the following code?
double result = 10 - 3 * 2 + 8 / 4.0;
System.out.println(result);

6.0

Input

100

What does the Scanner class let you do?

Allows user input

200

Write the code to create a new Scanner named scan.

Scanner scan = new Scanner(System.in);

300

What method of Scanner reads an integer value?

scan.nextInt();

400

Write the code to read a user’s name as a String. Include the print statement.

System.out.println("What is your name? ");
String name = scan.nextLine();

500

What do you need to include after using a scanner to input int or double?

scan.nextLine();

Module

100

What does module refer to?

The remainder of two numbers after division

200

What is the value of 10 % 4?

2

300

What is the value of 3 % 9?

3

400

What is the value of 4 % 5 % 0?

run time error

500

What is the value of 15.0 % 3.0?

0.0

Variables

100

What is wrong with the variable name 3score?

Variables cannot begin with a number.

200

What does it mean to initialize a variable?

You assign it a value

300

Declare a variable called age and initialize it to 17.5 in one line.

double age = 17.5;

400

What is the default value of a double variable?

0.0

500

What do you include when declaring a variable?

data type & name