Exception Handling

Question 1

What is an indication of a problem that occurs during program’s execution?

Answer 1

An exception

Question 2

What does exception handling do?

Answer 2

Creates applications to resolve exceptions, perform cleanup, notify, and terminate programs

Question 3

What virtual function does class exception provide to return error message?

Answer 3

what

Question 4

Which header defines runtime_error?

Answer 4

<stdexcept>
</stdexcept>

Question 5

What is the termination model of exception handling used by C++?

Answer 5

Control resumes to first statement after catch handler following try block

Question 6

What is a try block?

Answer 6

Defines a block of code in which exceptions might occur

Question 7

What follows a try block?

Answer 7

Atleast one catch handler

Question 8

What do you call the point in the program at which an exception occurs?

Answer 8

Throw point

Question 9

If exception occurs in a try block, try block expires and control transfers to first….

Answer 9

Catch with same parameter type

Question 10

Catch handlers should be in what order?

Answer 10

Most specific to least specific

Question 11

Stack unwinding?

Answer 11

Program terminates function and tries to locate try block in calling function when try has no catch

Question 12

Exception object

Answer 12

When operand of a throw is an object

Question 13

When exception handlers defers exception handling to another exception handler

Answer 13

Rethrowing the exception

Question 14

Common types of exceptions?

Answer 14

Out of range array subscripts
Arithmetic overflow
Division by zero
Invalid function parameters
Unsuccessful memory allocations

Question 15

Stack unwinding

Answer 15

Function where exception was not terminates and control returns to statement originally invoked

Question 16

What type of error is exception handling for?

Answer 16

Synchronous errors

Question 17

What is an asynchronous event?

Answer 17

Errors that occur in parallel with and independent of the programs flow of control

Question 18

How to declare if a function does not throw any exceptions?

Answer 18

noexcept

Question 19

Exceptions thrown by constructors cause….

Answer 19

Destructors on all objects

Question 20

Automatic objects constructed in try blocks are ____________ before an exception is thrown

Answer 20

Destructed

Question 21

When does stack unwinding complete?

Answer 21

Before exception handler begins executing

Question 22

What is when a destructor is invoked instead of leaking memory?

Answer 22

Resource allocation is initialization

Question 23

When operator new fails it throws….

Answer 23

bad_alloc exception

Question 24

When does new return a pointer to that memory?

Answer 24

When it allocates memory successfully

Question 25

When can a memory leak occur?

Answer 25

After successful memory allocation but before delete statement executes

Question 26

Which STL class deals with memory leaks?

Answer 26

unique_ptr

Question 27

unique_pointer does what?

Answer 27

Destructor performs delete on pointers data member

Question 28

Which operators does unique_pointer have?

Answer 28

• ->
  Copy constructor
  Overloaded assignment operator