Java Programming Basics

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Questions and Answers

What is the primary function of computer programs?

To perform calculations only
To serve as a user interface
To store data permanently
To tell computers what to do (correct)

Which of the following best describes a programming language?

A language exclusively for web development
A special language for writing computer programs (correct)
A method for data storage
A set of hardware specifications

What type of language does the CPU understand?

High-level programming language
Natural language
Machine language (correct)
Markup language

How is data represented in memory?

As a series of bits (A) Signup and view all the answers

What is NOT a benefit of using programming languages?

They replace the need for machine language (D) Signup and view all the answers

Which of the following statements is true about data storage in memory?

Characters and numbers can be stored as bit patterns (C) Signup and view all the answers

Which of the following is a characteristic of machine language?

It consists of binary-coded instructions (A) Signup and view all the answers

What is the role of programming languages in relation to computer programs?

To simplify the programming process (C) Signup and view all the answers

What type of error occurs when dividing by zero in Java?

Runtime error (A) Signup and view all the answers

What is the output of the code segment that computes Fahrenheit from Celsius incorrectly?

Celsius 35 is Fahrenheit degree 95 (C) Signup and view all the answers

What is the common misconception when calculating Fahrenheit from Celsius in Java?

Integer division is used instead of floating-point division (D) Signup and view all the answers

Which of the following statements about runtime errors is true?

They occur during the execution of the program. (B) Signup and view all the answers

How would you correctly compute Fahrenheit from Celsius for a value of 35 degrees Celsius?

Use the formula $9.0 / 5.0 \times 35 + 32$ (D) Signup and view all the answers

What type of error is indicated by a program that compiles successfully but produces incorrect results?

Logic Error (D) Signup and view all the answers

Which of the following is NOT a type of programming error?

Programmatic Error (B) Signup and view all the answers

What happens when a syntax error is detected during compilation?

The compiler provides error messages. (D) Signup and view all the answers

In which of the following cases would you encounter a runtime error?

Accessing an out-of-bounds array index (D) Signup and view all the answers

Identify the correct statement regarding syntax errors.

They occur due to incorrect structure in the code. (B) Signup and view all the answers

Which of the following statements would result in a syntax error?

System.out.println('Missing quote); (B) Signup and view all the answers

What is the primary difference between a syntax error and a logic error?

Syntax errors prevent compilation, while logic errors do not. (C) Signup and view all the answers

Which scenario correctly illustrates a syntax error in Java?

Neglecting a closing brace in a method (B) Signup and view all the answers

What is the significance of the braces {} in Java?

They enclose a block of statements. (B) Signup and view all the answers

Which symbol is used to mark the end of a statement in Java?

; (A) Signup and view all the answers

Which of the following symbols is used to enclose a string in Java?

"" (D) Signup and view all the answers

What type of programming construct does a pair of parentheses () represent in Java?

Method parameters (C) Signup and view all the answers

How are Java keywords formatted?

In lowercase letters (C) Signup and view all the answers

What is the purpose of double slashes // in Java?

To indicate the start of a comment (A) Signup and view all the answers

Which statement about arrays in Java is true?

Arrays are denoted by brackets. (A) Signup and view all the answers

Which of the following statements about Java source code is incorrect?

Identifiers in Java are not case sensitive. (A) Signup and view all the answers

What is the purpose of a semicolon in Java?

It signifies the end of a statement. (C) Signup and view all the answers

Which of the following is a reserved word in Java?

class (C) Signup and view all the answers

What will the following code print when executed? `System.out.println("Welcome to Java!");`

Welcome to Java! (A) Signup and view all the answers

In Java, which can you NOT use as identifiers?

public (D) Signup and view all the answers

Which statement is true regarding Java's case sensitivity?

Identifiers in Java can differ only by case. (B) Signup and view all the answers

What is the correct keyword to declare a class in Java?

class (D) Signup and view all the answers

Why can't reserved words be used as identifiers?

They have assigned meanings in the language syntax. (B) Signup and view all the answers

What is the function of the 'main' method in a Java program?

It is the entry point of any Java program. (C) Signup and view all the answers

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Study Notes

Data Storage

Data is stored in memory as a series of bits (zeros and ones).
Each piece of data, such as numbers, characters, and strings, has a corresponding memory address and a unique encoding.

Programs and Programming Languages

Computer programs are sets of instructions that tell computers what to do.
Programming languages are used to write these instructions in a way that is easier for humans to understand.
The CPU understands machine language, a set of primitive instructions built into every computer.