Question 1

The general principle underlying good object-oriented error handling is that any called function should check for errors and handle an error if one is found.

Accepted Answer

In object-oriented programming, it's generally considered good practice for a called function to throw or propagate exceptions rather than handle them, allowing the caller to decide on the appropriate error handling strategy.

Question 2

Calling functions from within ____ blocks can be dangerous, especially if you call the function that caused the thrown exception in the first place.

Accepted Answer

Calling functions within `catch` blocks can be dangerous because it might lead to a recursive loop if the function that caused the exception is called again, potentially causing the program to crash or behave unpredictably.

Question 3

Every function call is a(n) ____.

Accepted Answer

A function call is a message sent to the function to execute its code.

Question 4

A catch block ____ display, or to use in any way, what is thrown.

Accepted Answer

While a catch block is often used to handle or manipulate the exception that is thrown, it is not required to display or use it in any way. It is possible to use a catch block solely for the purpose of logging or notifying someone that an exception occurred without passing along any specific information about the exception itself. However, it is generally best practice to at least log or handle the exception in some way.

Question 5

The following dataEntry() function will not throw any exceptions: ____

Accepted Answer

Option A, "int dataEntry() throw()", specifies that the function does not throw any exceptions, adhering to older C++ exception specifications.

Question 6

Be careful when writing an exception specification using a(n) ____ because any type might eventually be instantiated.

Accepted Answer

Function templates can be instantiated with any type, therefore writing an exception specification using a function template can be risky as any type might eventually be used.

Question 7

When you include multiple catch blocks in a program, ____ catch block that is able to accept a thrown object is the one that will execute.

Accepted Answer

When multiple catch blocks are used, they are checked in order from top to bottom. The first catch block that matches the thrown object's type will be executed, and the rest will be skipped. Therefore, the "first" catch block that is able to accept a thrown object is the one that will execute.

Question 8

You create a default exception handler by creating a(n) ____ block with an ellipsis (…) as its parameter.

Accepted Answer

A default exception handler is created using the catch block with an ellipsis (...) as its parameter. This catch block catches any unhandled exceptions that might be thrown in the preceding try block.

Question 9

A general rule of ____ programming is that a function should be able to determine an error situation, but not necessarily take action on it.

Accepted Answer

The principle of modular programming states that functions should be self-contained and should not rely on the context in which they are called. They should be able to determine if an error occurred but it is not necessary for them to take action on it. This allows for better code reusability and maintainability.

Question 10

When using the exit() function, it is traditional to use a non-zero argument to indicate a program exited normally, and a 0 argument to indicate an error.

Accepted Answer

This statement is incorrect. A non-zero argument indicates an error, while a 0 argument indicates a normal exit.

Question 11

If you include an exception specification list with a function, and code a throw type that is not listed, the program will not compile.

Accepted Answer

Including an exception specification list with a function (e.g., using `throw()` in C++) does not prevent the program from compiling if a throw type not listed is used; however, it may result in undefined behavior at runtime if an unlisted type is thrown.

Question 12

A function can make multiple throws.

Accepted Answer

A function can make multiple throws using the throw statement within the code. However, it is recommended to limit the number of throws in a function for better code organization and readability.

Question 13

The exit() function requires a(n) ____ argument.

Accepted Answer

The exit() function in C language requires an integer argument which indicates the exit status of the program. This integer value will be returned to the parent process, which can use this value to determine whether or not the child process has executed successfully.

Question 14

A(n) ____ resembles a return statement in a function, except that the execution of the program does not continue from where the function was called.

Accepted Answer

A throw statement is used to "throw" an exception when a certain condition is met, similar to returning a value in a function. However, unlike a return statement, a throw statement immediately stops the execution of the current code block and begins searching for a catch block to handle the exception.

Question 15

To handle a thrown object, you include one or more ____ blocks in your program immediately following a try block.

Accepted Answer

To handle a thrown object, you need to catch it using a catch block after a try block. Exit blocks are used to terminate the program, while throw blocks are used to throw the exception. Therefore, the best choice is option B, catch.

Question 16

In Visual C++, ____ is interpreted the same as throw(...) .

Accepted Answer

The answer of In Visual C++, ____ is interpreted the...

Question 17

In ANSI C++, if a function throws an error whose type was not listed in its exception specification, then it will produce a run-time error called a(n) ____ exception, and abort the program.

Accepted Answer

If a function throws an exception that was not specified in its exception specification, then it will produce an unexpected exception at runtime and terminate the program. Therefore, the correct option is D - unexpected.

Question 18

If you use a default catch block, it ____.

Accepted Answer

The default catch block must be the last one listed after a try. This is because if it's placed before any other catch blocks, it will catch all exceptions, including those that should be caught by more specific catch blocks. Placing it after all other catch blocks allows for more specific exceptions to be caught and handled appropriately, while the default catch block serves as a catch-all for any exceptions that weren't specifically handled.

Question 19

If you want a catch block to execute, it must catch the correct type of argument thrown from a try block.

Accepted Answer

The catch block must catch the correct type of exception thrown from the try block in order to execute.

Question 20

You throw an exception by using the keyword throw followed by ____ object.

Accepted Answer

The answer of You throw an exception by using the...

Quiz 12: Handling Exceptions