How Well Do You Know C++ UB?

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adaptablebastio

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adaptablebastio

6/20/2024

90%

Answers

1. What does UB stand for in C++?

Undefined Behavior

Uniform Binary

Unlimited Bounds

Universal Base

2. Which of the following is a common cause of undefined behavior in C++?

Using a smart pointer

Casting an int to a float

Dereferencing a null pointer

Using a for loop

3. What can be a result of invoking undefined behavior in a C++ program?

The program runs slower

The program could produce unpredictable results

The code will always give a compile-time error

The program uses more memory

4. Which of the following operations on an integer can lead to undefined behavior?

Addition

Subtraction

Division by zero

Multiplication

5. Is it safe to modify a string literal in C++?

Yes, it is safe

Yes, but only if the literal is not used again

No, it results in undefined behavior

No, it is safe but generally not recommended

6. What happens when you access an array out of its bounds in C++?

Nothing happens

It results in undefined behavior

The program catches an exception

You get a warning at compile time

7. Which of the following is NOT a cause of undefined behavior?

Reading uninitialized variables

Shifting bits by a negative amount

Correctly using unique_ptr

Accessing a dangling pointer

8. Why is it important to avoid undefined behavior in C++ programs?

It can make the code less readable

It can lead to non-portable code

It can introduce security vulnerabilities

It uses more CPU resources

9. Which of these can lead to undefined behavior when using pointers?

Initializing a pointer with nullptr

Dereferencing a null pointer

Assigning one pointer to another

Using a const pointer

10. What is the recommendation to prevent undefined behavior related to type conversions in C++?

Avoid using typecasting

Carefully use static_cast, dynamic_cast, etc.

Use only implicit type conversions

Ignore compiler warnings

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