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Basic Java Programming Quiz

Description: Basic Java Programming Quiz
Number of Questions: 10
Created by:
Tags: java
Attempted 0/10 Correct 0 Score 0

What is the size of a Char?

  1. 4 bits

  2. 7 bits

  3. 8 bits

  4. 16 bits


Correct Option: D
  1. Static

  2. Private

  3. Default


Correct Option: B

Following code will result in: int a = 3.5;

  1. Compilation error

  2. Runtime error

  3. a being 3.5

  4. a being 3.


Correct Option: A
Explanation:

To solve this question, the user needs to have an understanding of variable types and type casting in programming.

Explanation for each option:

A. Compilation error: This option is correct. In many programming languages, including Java, assigning a floating-point value (such as 3.5) to an integer variable (such as int a) will result in a compilation error. This is because the two types are not compatible, and an explicit type casting is required.

B. Runtime error: This option is incorrect. Runtime errors occur when a program is executed and encounters an error, but in this case, the error would be caught by the compiler during the compilation phase.

C. a being 3.5: This option is incorrect. As mentioned earlier, assigning a floating-point value to an integer variable will result in a compilation error. The value 3.5 cannot be stored in an int variable.

D. a being 3: This option is incorrect. Since the value 3.5 cannot be stored in an int variable, the value of a will not be 3. The code will not compile, so no value will be assigned to a.

Therefore, the correct answer is:

A. Compilation error

  1. Compilation error

  2. Runtime error

  3. No errors


Correct Option: C
Explanation:

To solve this question, the user needs to understand the concept of type casting and data types in programming.

The given code snippet initializes an integer variable a1 with the value 5 and then assigns that value to a double variable a2 after performing a type casting to a float.

Now, let's go through each option and explain why it is right or wrong:

A. Compilation error: This option is incorrect. The code will compile without any errors because type casting from an integer to a float is allowed in most programming languages.

B. Runtime error: This option is incorrect. The code will not result in a runtime error because the type casting from an integer to a float is allowed and will not cause any issues at runtime.

C. No errors: This option is correct. The code will execute without any errors, and the value 5 will be successfully assigned to the a2 variable after the type casting.

Therefore, the correct answer is: C. No errors.

Following code will result in: int a = 9/0;

  1. Compilation error: Divisions must be in a try block.

  2. Compilation error: DivideByZeroException

  3. Runtime Exception

  4. No Error: a is NaN


Correct Option: C

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) Compilation error: Divisions must be in a try block - This option is incorrect. Divisions do not need to be in a try block. The try-catch block is used to handle exceptions that may occur during the execution of a program, but it is not necessary for all divisions.

Option B) Compilation error: DivideByZeroException - This option is incorrect. The code will compile without any errors.

Option C) Runtime Exception - This option is correct. When dividing an integer by zero, a runtime exception called "ArithmeticException" is thrown. In this case, the code will throw a "ArithmeticException: divide by zero" runtime exception.

Option D) No Error: a is NaN - This option is incorrect. NaN (Not a Number) is a special value in some programming languages that represents an undefined or unrepresentable value. However, in Java, dividing an integer by zero does not result in NaN. It throws an exception instead.

The correct answer is C) Runtime Exception. This option is correct because dividing an integer by zero will result in a runtime exception.

Following code will result in: float a = 9/0;

  1. Compilation error: Divisions must be in a try block

  2. Compilation error: DivideByZeroException

  3. Runtime Exception

  4. No Error: a is NaN


Correct Option: C

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) Compilation error: Divisions must be in a try block - This option is incorrect because there is no requirement to enclose divisions in a try block. The try-catch block is used to handle exceptions, but it is not necessary for every division operation.

Option B) Compilation error: DivideByZeroException - This option is incorrect because there is no compilation error related to a divide-by-zero exception. In this case, a runtime exception will occur.

Option C) Runtime Exception - This option is correct. The division by zero operation is not allowed in mathematics, and it will result in a runtime exception called "ArithmeticException: Divide by zero". Therefore, executing the given code will result in a runtime exception.

Option D) No Error: a is NaN - This option is incorrect. NaN (Not a Number) is a special floating-point value that represents an undefined or unrepresentable result. However, dividing by zero does not result in NaN. It results in a runtime exception.

The correct answer is C. The code will result in a runtime exception.

A class can be transient

  1. True

  2. False


Correct Option: B
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