Pre-Assessment: Java Basics

1. What is a variable?

• A location in memory with a name and a type

• A keyword in Java programming

• A method to print output

• A loop in a program

1. How do you declare a variable in Java?

• Using a keyword "declare"

•  By assigning a value directly without declaration

• By specifying its type and giving it a name

• By using quotation marks around the value

Which primitive type is used for numbers with decimal places in Java?

• int

• double

• char

• boolean

What is the default type of a literal number in Java?

• double

• float

• int

• long

What is the output of the following code:

System.out.println("Hello"+5+3); ?

• Hello53

• 8

• Hello8

• there is an error

In Java, which of the following is NOT a primitive data type?

• char

• double

• string

• boolean

What is the result of the expression
2 + 3 * ( 4 % 5 )
in Java?

• 14

• 20

• 4

• 10

What is the purpose of the ternary operator in Java?

• to work with three operands

• to evaluate boolean expressions

• to perform bitwise operations

• to assign values to variables

When does Java require a cast for data type conversion?

• only for widening conversions

• only for narrowing conversions

• for both widening and narrowing conversions

• java never requires casting for data type conversions

What is the purpose of using parentheses in java expressions?

• to multiply operands

• to divide operands

• to change the default order of operator precedence

• to add operands