Question 1

Describe the circumstances that the unexpected()function will be called.

Accepted Answer

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Question 2

How can you write a catch block that will catch all exceptions that have been thrown but not yet caught?

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Question 3

Write a definition for an exception class,E,that contains an error number and a string type error name.Include a constructor that creates an E object and initializes both members.Provide accessors for both the message and error number.

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Question 4

What is the purpose of exception handling?

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Question 5

The situations where exceptions are used put the try block with the throw statement followed by the catch block all in one function.

Accepted Answer

Exceptions can be thrown in one function and caught in another. The try block where the exception is thrown does not have to be in the same function as the catch block that handles the exception.

Question 6

Explain how the mechanism for deciding which catch block catches an exception is like the mechanism for deciding which function definition is used when an overloaded function is called.

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Question 7

A function that satisfies its preconditions but cannot fulfill its postconditions should throw an exception.

Accepted Answer

If a function is unable to fulfill its postconditions, it means that either it encountered an error or the input data was incorrect. In such cases, the function should throw an exception to indicate that something went wrong. This helps the caller of the function to diagnose the problem and take appropriate action. Therefore, throwing an exception when the postconditions are not met is the correct behavior.

Question 8

Write just a catch block with a catch block parameter type that will catch all exceptions that are yet uncaught.

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Question 9

When an exception is thrown,the function finishes its execution,its value is returned,then control is transferred to the catch block.

Accepted Answer

When an exception is thrown, the normal execution of the function stops immediately and control is transferred directly to the catch block. The value that was being calculated or processed at the time the exception occurred is never returned.

Quiz 18: Exception Handling