Java Data Types and Variables Quiz

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What is a variable?

A program for storing values

A named storage location in computer memory (correct)

A data type in Java

A type of primitive data in Java

Which Java data type allows for very small integers?

double

int

float

byte (correct)

What is the range of values for the 'long' data type in Java?

-32768 to 32767

-2147483648 to 2147483647

+/- 4.9 * 10^-324 to 1

-9223372036854775808 to 9223372036854775807 (correct)

Which data type in Java is used for real numbers?

double Signup and view all the answers

What are the eight primitive or scalar types of Java collectively referred to as?

Primitive Data Types Signup and view all the answers

What is the purpose of declaring variables in a program?

To allocate memory and assign a name to a storage location Signup and view all the answers

Which Java type allows for very small integers of size 1 byte?

byte Signup and view all the answers

What is the correct way to declare a variable to hold the player's score in a computer game?

int score ; Signup and view all the answers

Which data type in Java should be used to hold real numbers?

double Signup and view all the answers

What is the correct way to assign a value of 0 to the variable named 'score'?

int score = 0; Signup and view all the answers

Which Java type allows for true or false values with a size of 1 bit?

boolean Signup and view all the answers

What is the correct way to put the initial difficulty level to 'A' in a Java program?

level = 'A'; Signup and view all the answers

What happens if you try to declare a variable using 'int score = 2.5 ;' in Java?

It will give a syntax error Signup and view all the answers

What is the correct way to declare several variables of the same type on a single line in Java?

int x, y, z; Signup and view all the answers

What should you use to output a message on the screen in Java?

.println() Signup and view all the answers

What is the purpose of using the concatenation operator in Java?

To combine two or more strings into one Signup and view all the answers

What is the significance of using constants in a Java program?

They improve the readability of the code Signup and view all the answers

How are constants declared in Java?

By using the 'final' keyword Signup and view all the answers

What is the convention for naming constants in Java?

Using all uppercase letters Signup and view all the answers

What is the purpose of using variables in a Java program?

To hold data that may vary during program execution Signup and view all the answers

Which operator in Java is used for combining multiple strings into one?

<ul> <li></li> </ul> Signup and view all the answers

What is the data type used for real numbers in Java?

double Signup and view all the answers

In Java, what are symbolic constants used for?

Representing fixed values whose values do not change Signup and view all the answers

What happens if an attempt is made to modify a constant in a Java program?

It will result in a compilation error Signup and view all the answers

Which keyword is used to declare constants in Java?

'final' Signup and view all the answers

Java Data Types and Variables Quiz

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Questions and Answers

What is a variable?

Which Java data type allows for very small integers?

What is the range of values for the 'long' data type in Java?

Which data type in Java is used for real numbers?

What are the eight primitive or scalar types of Java collectively referred to as?

What is the purpose of declaring variables in a program?

Which Java type allows for very small integers of size 1 byte?

What is the correct way to declare a variable to hold the player's score in a computer game?

Which data type in Java should be used to hold real numbers?

What is the correct way to assign a value of 0 to the variable named 'score'?

Which Java type allows for true or false values with a size of 1 bit?

What is the correct way to put the initial difficulty level to 'A' in a Java program?

What happens if you try to declare a variable using 'int score = 2.5 ;' in Java?

What is the correct way to declare several variables of the same type on a single line in Java?

What should you use to output a message on the screen in Java?

What is the purpose of using the concatenation operator in Java?

What is the significance of using constants in a Java program?

How are constants declared in Java?

What is the convention for naming constants in Java?

What is the purpose of using variables in a Java program?

Which operator in Java is used for combining multiple strings into one?

What is the data type used for real numbers in Java?

In Java, what are symbolic constants used for?

What happens if an attempt is made to modify a constant in a Java program?

Which keyword is used to declare constants in Java?

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