Self Assesment Questions 21

Instructions

For each question choose the single response which best answers the question, or which completes the statement most accurately.

Question 179: An exception is:

an unusual state that the program enters only rarely.

an interrupt (or signal) received by the program from the operating system.

an object which propagates up the call stack looking for an error handler.

an object which propagates down the call stack looking for error conditions to handle.

a "net" placed around a piece of code, to catch any errors.

Question 180: In C++ exceptions will only be caught when they are thrown by code:

which is physically located in a try block.

which has been called from a try block.

which is physically located in a catch block.

which has been called from a catch block.

which has not yet executed.

Question 181: As an exception propagates it:

destructs any locally-declared objects created in any function through which it passes.

destructs any dynamically-allocated objects created in any function through which it passes.

destructs any locally-declared or dynamically-allocated objects created in any function through which it passes.

does not destruct any objects created in any function through which it passes.

only destructs objects declared in the try block which eventually catches it.

Question 182: One advantage of using exceptions (as opposed to other error-handling techniques) is that:

You don't have to specify how the code should handle the error, because the compiler takes care of that.

You don't have to specify where the exception should be thrown, because the compiler takes care of that.

You don't have to put error-handling code in every function, only those that detect or handle errors.

You don't have to worry about your program terminating, since exceptions never cause a program to exit.

Exceptions are built into the C++ language.

Question 183: If a try block has two or more associated catch blocks, which of them will be triggered by an exception?

The first one whose catch parameter type matches that of the exception.

The last one whose catch parameter type matches that of the exception.

The one whose catch parameter type most closely matches that of the exception.

Every one whose catch parameter type matches that of the exception.

The only one whose catch parameter type matches that of the exception. If two or more catch blocks would match, the compiler flags an ambiguity.

Last updated: October 1, 2005