Deck 16: Exception Handling

Question 1

The proper syntax for a throw list is:

A) int g double h ) throw a, b, c )
B) int g double h ) throw a b c )
C) int g double h ) throw a )
Throw b )
Throw c )
D) int g double h ) throw a ),
Throw b ),
Throw c )

Answer 1

A

Question 2

Placing throw) after a function's parameter list:

A) Guarantees that all exceptions can be thrown in this function.
B) Guarantees that only programmer-defined exceptions can be thrown in this function.
C) Indicates that throwing an exception in this function would call unexpected.
D) Indicates that the compiler will issue an error if the function contains a throw expression.

Answer 2

C

Question 3

The try block cannot:

A) Enclose the code that may throw the exception.
B) Enclose its own catch blocks.
C) Test enclosing try blocks for additional catch statements if this try block's catch statements can't match the exception being thrown.
D) Have exceptions explicitly or implicitly thrown in the try block itself.

Answer 3

B

Question 4

Exception handling should not be used:

A) As an alternative for program control.
B) To make error handling uniform on large projects.
C) To deal with errors that do not arise very often.
D) To deal with errors for components that will be widely used in other applications, such as classes and libraries.

Question 5

An exception:

A) Terminates program execution.
B) Terminates the block where the exception occurred.
C) Will terminate the block where the exception occurred unless a catch command stops it.
D) Will not terminate a block unless explicitly instructed to do so.

Question 6

Select the false statement. The new operator:

A) Can attempt to allocate as much memory as the programmer requests.
B) Returns a pointer to a location in memory.
C) Can indicate failure differently on different compilers.
D) Throws a bad_alloc exception regardless of what function is registered with set_new_handler.

Question 7

Catch blocks are not required to contain:

A) Braces { }.
B) Parentheses ).
C) Some form of parameter type indication.
D) A parameter name.

Question 8

An advantage of using inheritance with exceptions is:

A) The ability to catch related errors easily.
B) Allowing catch statements to be imported into classes.
C) The ability to explicitly test for derived class objects individually.
D) The simplification of destructor calls for objects.

Question 9

The correct order in which an exception is detected and handled is:

A) try, catch, throw
B) throw, catch, try
C) catch, throw, try
D) try, throw, catch

Question 10

Select the false statement. Depending on the compiler:

A) A failed new operation can return a 0.
B) A failed new operation can throw a bad_alloc exception.
C) A failed new operation can throw an exception if the header file has been included.
D) A failed new operation can automatically be caught at compile time.

Question 11

Exception handling may allow a program to:

A) Terminate in a controlled manner.
B) Be more robust and fault-tolerant.
C) Continue executing as if no problem was encountered.
D) All of the above.

Question 12

If dynamic memory has been allocated for an object and an exception occurs, then:

A) The catch block will not work properly.
B) A memory leak could result.
C) The object's constructor will cause another exception.
D) Multiple pointers to memory could be created.

Question 13

Select the false statement. A rethrown exception:

A) Is detected by the next enclosing try block.
B) Is the immediate result of a throw command.
C) Can be processed by exception handlers following the enclosing try block.
D) Must have been fully processed at the time it was rethrown.

Question 14

To rethrow an exception, the exception handler must:

A) Use the throw; statement.
B) Use the throw command with the same parameters as the original exception.
C) Return a reference to whatever caused the original exception.
D) Not have attempted to process that exception at all.

Question 15

Which of the following is not a case in which function terminate is called?

A) When the exception mechanism cannot find a matching catch for a thrown exception.
B) When the abort function is called before any call to function set_abort.
C) When a destructor attempts to throw an exception during stack unwinding.
D) When an attempt is made to rethrow an exception when there is no exception currently being handled.

Question 16

The purpose of stack unwinding is to:

A) Attempt to catch exceptions that are not caught in their scope.
B) Improve catch blocks by allowing them to handle multiple exceptions.
C) Return control to the function that created the exception.
D) Aid the terminate command in shutting down the program.

Question 17

Which of the following is an advantage of not using exception-handling to deal with errors?

A) Intermixing program logic with error-handling logic can make the program more difficult to read, modify, maintain and debug.
B) Frequent tests for infrequently occurring errors can degrade a program's performance.
C) Programmers may delay writing error-processing code or sometimes forget to include it.
D) None of the above.

Question 18

Select the false statement. If an exception is thrown from a constructor:

A) The object being constructed will not be constructed.
B) For an array, destructors for all array elements are called, even if those array elements have not yet been constructed.
C) The exception can contain the error information that the constructor would not be able to return in the normal manner.
D) For an object with member objects, and whose outer object has not been constructed, the destructor is called for the member objects.

Question 19

Once an exception is thrown, when can control return to the throw point?

A) Never.
B) Only after the exception is caught.
C) Once the stack unwinding process is completed.
D) Immediately after the exception is thrown.

Question 20

Select the false statement. The functions set_terminate and set_unexpected:

A) Return pointers to the last function called by terminate and unexpected, respectively.
B) Each return 0 the first time they are called.
C) Take as arguments pointers to void functions with no arguments.
D) Have their prototypes in header file .

Question 21

Both "ignoring the exception" and "aborting the program" are error-handling techniques that:

A) Cannot be used if the error is fatal.
B) Always result in a resource leak.
C) Should not be used for mission-critical applications.
D) Allow program execution to proceed as if no error had occurred.

Question 22

Select the false statement regarding exceptions.

A) The C++ standard has a hierarchy of exception classes.
B) All exception classes are accessible via .
C) Several classes derive from class exception.
D) The what function can be overridden in each class derived from exception.

Question 23

Which class indicates that an error occurred in which an arithmetic result was larger than the largest number that can be stored in the computer?

A) invalid_argument.
B) bad_exception.
C) out_of_range.
D) overflow_error.

Question 24

Which of the following is not an error-handling technique?

A) exit.
B) longjump.
C) ifndef.
D) set_new_handler.