Welcome to our blog post, "C++ Exception Handling MCQ Quiz - MCQ Questions and Answers." Exception handling is a crucial aspect of robust C++ programming, ensuring that your applications can gracefully handle and recover from unexpected situations.
This quiz is designed to test and reinforce your knowledge of exception handling in C++. Whether you're a student, a programming enthusiast, or a professional developer, these carefully crafted multiple-choice questions offer a great way to assess your understanding of C++'s exception-handling mechanisms. Accompanied by detailed answers, this quiz serves as an effective learning tool, helping you to solidify your grasp of this important concept in C++. Let's jump into the world of C++ exception handling and put your skills to the test!
1. What is exception handling in C++?
Answer:
Explanation:
Exception handling in C++ involves dealing with runtime errors in a controlled and systematic way using try, catch, and throw statements.
2. Which keyword is used to throw an exception in C++?
Answer:
Explanation:
The 'throw' keyword is used to throw an exception when a problem is detected in a program.
3. Which block is used to handle exceptions in C++?
Answer:
Explanation:
The catch block is used to handle exceptions. It contains code that is executed when an exception is thrown in the corresponding try block.
4. What is the purpose of the try block in C++?
Answer:
Explanation:
The try block contains a block of code that might generate an exception and is followed by one or more catch blocks to handle potential exceptions.
5. How many catch blocks can follow a try block?
Answer:
Explanation:
A try block can be followed by multiple catch blocks, each designed to handle a different type of exception.
6. Can a catch block exist without a corresponding try block?
Answer:
Explanation:
A catch block must always be associated with a try block. It cannot exist independently in a C++ program.
7. What happens if an exception is not caught?
Answer:
Explanation:
If an exception is thrown but not caught, it leads to abnormal termination of the program.
8. Can you have an empty throw statement in C++?
Answer:
Explanation:
An empty throw statement, used inside a catch block, is used to rethrow the currently handled exception. It is useful for catching an exception, performing some cleanup, and then rethrowing it.
9. What is the correct syntax for catching any type of exception in C++?
Answer:
Explanation:
The catch(...) syntax is used to catch any type of exception. It's known as a catch-all handler.
10. What does the 'std::exception' class represent in C++?
Answer:
Explanation:
'std::exception' is the base class for all standard exception classes in C++. It provides a common base to derive custom exceptions.
11. Can a function signature include an exception specification in C++?
Answer:
Explanation:
In C++, a function signature can include an exception specification, which lists the exceptions that the function might throw. However, this practice is generally discouraged in modern C++.
12. How do you create a custom exception in C++?
Answer:
Explanation:
Custom exceptions in C++ can be created by inheriting from the std::exception class and overriding the what() method to provide a custom error message.
13. What is exception propagation in C++?
Answer:
Explanation:
Exception propagation refers to the process where an exception is thrown from a function and is caught in the caller of that function.
14. What is the output of the following C++ code if an exception is not thrown?
try {
// Code that does not throw an exception
} catch(...) {
cout << "Exception caught";
}
Answer:
Explanation:
If no exception is thrown in the try block, the catch block is not executed, and there will be no output.
15. What type of exceptions does the 'std::runtime_error' class represent?
Answer:
Explanation:
The std::runtime_error class in C++ is used to represent exceptions that occur during the execution of the program, such as arithmetic errors or invalid arguments.
16. Can multiple exceptions be thrown from a single try block?
Answer:
Explanation:
Only one exception can be thrown from a try block at a time. Once an exception is thrown, control is transferred to the catch block, and the rest of the try block is skipped.
17. What is a nested try block in C++?
Answer:
Explanation:
Nested try blocks refer to a try block placed inside another try block. This is useful for handling exceptions in different scopes or for different parts of code within a function.
18. What happens when an exception is thrown and caught in the same function?
Answer:
Explanation:
When an exception is thrown and caught in the same function, the function continues execution after the catch block, unless the catch block contains a return statement or rethrows the exception.
19. How do you declare that a function might throw a specific exception in C++?
Answer:
Explanation:
In C++, a function can declare that it might throw specific exceptions using the throw keyword followed by the exception type in the function declaration. However, this is considered deprecated in modern C++ standards.
20. Is it possible to catch an exception thrown by a constructor in C++?
Answer:
Explanation:
Exceptions thrown by constructors can be caught in C++ by placing the object creation code inside a try block and catching the exception in the corresponding catch block.
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